HCR 593 Applied Project

Abstract

The present research discussed the efficacy of the regulatory initiatives that the Food Safety and Inspection Service (FSIS) implemented in preventing the growth of Listeria monocytogenes in ready-to-eat (RTE) meat and poultry products. Three research questions were considered in the study: the regulatory controls applied by FSIS, the pattern of recall between 2018 and 2025, and the potential implementation gaps. Regulatory literature and the FSIS Recall Case Archive were examined to retrieve data and analyzed it to derive the major trends and patterns.

The results showed that FSIS has certain preventive systems, including Hazard Analysis and Critical Control Point (HACCP) systems, sanitation control, an environmental monitoring plan, and zero tolerance for Listeria monocytogenes. These tests are supposed to prevent contamination and ensure food safety. However, the data on recalls suggested that the incidences of contamination still occur within the food system.

There were some recall patterns that were noted, which included large-scale recalls and recall expansions. Most of the recalls involved ready-to-eat deli meats and processed poultry products, and they were high risk. The findings also indicated that the post-lethality contamination and environmental persistence of the pathogen are still a serious challenge.

The study concludes that FSIS regulatory controls are well-tailored but need to be properly implemented to be comprehensive. The findings indicate that there is a need to improve hygiene practices, environmental monitoring and control. This study contributes to the information on food safety systems, and it has a point to contribute to further studies and improve the control of Listeria monocytogenes.

 

Table of Contents

Abstract…………………………………………………………………………………………………………………….. 2

Chapter 1…………………………………………………………………………………………………………………… 5

Introduction……………………………………………………………………………………………………………. 5

Statement of the Problem……………………………………………………………………………………… 6

Purpose of the Study……………………………………………………………………………………………. 7

Importance of the Study……………………………………………………………………………………….. 7

Overview of Research Design………………………………………………………………………………. 8

Research Questions……………………………………………………………………………………………… 8

Assumptions………………………………………………………………………………………………………. 8

Limitations and Delimitations………………………………………………………………………………. 9

Definition of Terms……………………………………………………………………………………………….. 10

Chapter 2…………………………………………………………………………………………………………………. 11

Literature Review………………………………………………………………………………………………….. 11

Theme 1: Public Health Significance and Risk Characteristics of Listeria monocytogenes      11

Theme 2: FSIS Regulatory Framework and Environmental Control Challenges……….. 13

Theme 3: Recall Trends as Indicators of Regulatory Effectiveness………………………….. 14

Synthesis and Identification of the Gap………………………………………………………………… 16

Chapter 3…………………………………………………………………………………………………………………. 18

Method………………………………………………………………………………………………………………… 18

Review of the Background Literature…………………………………………………………………… 18

Regulatory Recall Trend Analysis…………………………………………………………………………… 20

Data Analysis Procedure………………………………………………………………………………………… 23

Chapter 4…………………………………………………………………………………………………………………. 26

Results…………………………………………………………………………………………………………………. 26

Regulatory Controls Used by FSIS to Prevent Listeria monocytogenes……………………. 27

Observed Patterns in Listeria Recall Events………………………………………………………….. 28

Summary of Recall Trends Identified in the Data………………………………………………….. 29

Indicators of Possible Implementation Challenges…………………………………………………. 31

Chapter 5…………………………………………………………………………………………………………………. 33

Discussion……………………………………………………………………………………………………………. 33

Research Question 1: Regulatory Controls Used by FSIS………………………………………. 33

Research Question 2: Patterns in FSIS Listeria-Related Recalls (2018–2025)…………… 34

Research Question 3: Indications of Regulatory or Implementation Loopholes…………. 35

Integration with the Research Gap………………………………………………………………………. 35

Future Research Directions…………………………………………………………………………………. 36

Limitations and Delimitations…………………………………………………………………………….. 36

References……………………………………………………………………………………………………………….. 39

Appendices……………………………………………………………………………………………………………… 41

Table 1:……………………………………………………………………………………………………………….. 41

Literature Search and Screening Summary………………………………………………………………. 41

Table 2: Detailed FSIS RTE Listeria monocytogenes Recall Dataset (2018–2025)……….. 42

Table 3…………………………………………………………………………………………………………………. 45

Summary of Observed FSIS Listeria Recall Patterns in Ready-to-Eat Meat and Poultry Products (2018–2025)…………………………………………………………………………………………………………………… 45

 

 

 

Evaluation of FSIS Regulatory Effectiveness in Controlling Listeria monocytogenes in Ready-to-Eat Meat and Poultry Products

Chapter 1

Introduction

Food-borne diseases remain a major recurrent international health issue, even with the massive waves of modernization of regulation and preventive food safety systems. Listeria monocytogenes is a bacterial pathogen with an exceptionally high level of hospitalization and mortality compared to incidence, making it an exceptionally challenging regulatory challenge. Although listeriosis is not as common as other Salmonella- or Campylobacter-related diseases, its severity, especially in pregnant women, the elderly, and immunocompromised patients, underscores its regulatory significance (Yangchen et al., 2025).

Ready-to-eat (RTE) meat and poultry products are more hazardous to people since they are eaten without any further cooking. Contamination that occurs after thermal treatment is called post-lethality contamination, and it directly increases the risk of consumer exposure. L. monocytogenes can survive at refrigeration temperatures and remain active during processing, unlike most other pathogens, which makes contamination more likely, especially in products with a long shelf life (Kurpas et al., 2020).

In the United States of America, RTE meat and poultry products are actively regulated by the Food Safety and Inspection Service (FSIS). Under the 9 CFR 430, FSIS does not permit any detectable L. monocytogenes in the ready-to-eat (RTE) products. Companies are required to employ HACCP systems, Sanitation Standard Operating Procedures (Sanitation SOPs), post-lethality treatment and environmental monitoring programs to avoid contamination.

Despite this detailed system of regulation, Listeria-related recalls still occur. This recurrent tendency raises an applied regulatory science question: Do existing FSIS regulatory controls effectively stem out contamination, or are there implementation and verification loopholes?

Statement of the Problem

Despite the implementation of science-based regulatory measures by the United States Department of Agriculture’s Food Safety and Inspection Service, contamination of ready-to-eat (RTE) meat and poultry products with Listeria monocytogenes continues to occur. These contamination events result in product recalls each year. The resilience of pathogens, environmental persistence, and quantitative risk modeling have been studied in scientific literature as contributors to the contamination risk (Hadjicharalambous et al., 2022; Kurpas et al., 2020). In its turn, regulatory scholarship has stressed preventive controls, compliance frameworks, and enforcing mechanisms in federally-inspected establishments (Zhang et al., 2021).  However, a critical gap remains in the integration of these domains. In particular, only a few studies have conducted a systematic assessment of the regulatory design and its enforcement in relation to recognizable longitudinal dynamics of recollection. It is hard to either discard or confirm whether the frequent instances of contamination are isolated incidents of operational failures or reflect systemic vulnerabilities in the FSIS-inspected plants. This is because a recall, as a quantifiable regulatory outcome, is hard to interpret without deeper analysis.

The present research addresses a gap in the literature concerning the lack of an integrative assessment. Specifically, there is limited work connecting FSIS regulatory measures with empirical trends in recall patterns. Filling the gap can assist with identifying the regulatory effectiveness in practice.

Purpose of the Study

This literature review evaluated the effectiveness and efficiency of regulatory controls implemented by the Food Safety and Inspection Service (FSIS) in preventing Listeria monocytogenes contamination in ready-to-eat meat and poultry products. It used regulatory frameworks alongside recall trend data from 2018 to 2025 to assess how well these measures work in practice. In particular, the research aimed to examine trends in longitudinal recalls to determine whether recurring recall trends indicate regulatory inefficiencies or ineffective implementation of facilities regulated by the FSIS. The study combined analysis of regulatory frameworks and data on an empirical recall into an effort to determine whether the regulatory intent is consistent with quantifiable health impacts on the people.

Importance of the Study

This paper advances regulatory science by assessing the consistency between regulatory design and measurable outcome measures, especially the recall frequency and the severity of recall classification. Although microbiological studies describe the behavior and persistence of pathogens, there is a shortage of applied studies that determine whether regulatory action can be translated into a better safety output at the establishment level.

Because of the serious nature of listeriosis, including hospitalization and mortality rates, and the high cost and reputation implications of product recall, it is necessary to investigate the effectiveness of FSIS regulatory measures. The results of this research can be used to refine regulations, reinforce implementation efforts, and facilitate evidence-based changes to ensure improved public health and industry conformity.

Overview of Research Design

The project applied:

1. An organized Literature Review based on the Funnel Approach.
2. Regulatory recall trend analysis using FSIS Recall Case Archive data.

The literature analysis was a synthesis of current studies to determine what has been done and what has not been done. The narrative literature review is a technique used to summarize and explain the current study, identifying patterns, gaps, and connections within a body of knowledge (Snyder, 2019). The recall analysis measures the empirical outcomes patterns in order to determine the effectiveness of regulations.

Research Questions

1. What are the regulatory controls that FSIS uses to control Listeria monocytogenes in RTE meat and poultry products?
2. What patterns are observable in FSIS Listeria-related recalls between 2018 and 2025?
3. Are there indications of regulatory or implementation loopholes in the recall patterns?

Assumptions

Assumptions are stated as true without empirical testing and are needed to proceed with the study (Creswell and Creswell, 2018). These assumptions in the research reflect the background on which it is based, since at times it is impossible, or at least impractical, to quantify all the variables and situations that influence the research process. They help interpret data, choose sources, and determine the direction of the study. The researcher has explicitly identified these assumptions, which provides transparency and allows the reader to interpret the findings in a more context-specific way, and also specifies the restrictions on where the findings can be applied.

This project operates under several key assumptions:

• FSIS Recall Case Archive data is an accurate reflection of reported outbreaks of contamination.
• Literature on risks offers scientifically valid explanations of risks.
• Regulatory requirements are uniformly applied in establishments, but not necessarily effectively.
• Recall frequency and classification are proxy indicators of the performance of the regulatory outcomes.

Limitations and Delimitations

Potential weaknesses of a study that cannot be controlled by the researcher are called limitations, whereas limitations are the boundaries deliberately imposed by the researcher to clarify the scope of the study (Theofanidis and Fountouki, 2018). Limitations can be imposed by factors such as data or information availability or methodological constraints, and they can affect the interpretation or generalizability of the findings. Delimitations, on the other hand, are the researcher’s choices about what to include or exclude in the research, such as the population, variables, time, or context under investigation. Combined, the limitations and delimitations clarify the scope of the research and the limitations it might encounter.

There are a number of limitations with this study. The study is primarily based on publicly accessible recall data, which is likely to miss all the contamination events. Some cases might go unreported or may not even result in an official recall. Moreover, the research lacks access to internal compliance documents and proprietary food establishment data that would be more detailed regarding the regulatory practices. The research also entails a number of delimitations that establish the research scope. It reviews FSIS-regulated ready-to-eat (RTE) meat and poultry products only. The Food and Drug Administration (FDA) regulated products are not covered by the analysis. Literature review primarily concentrates on peer-reviewed publications that occurred from 2018 to 2025, unless earlier articles are regarded as foundational. Lastly, there is no laboratory testing or experiment, as the research is grounded on the regulatory data and available literature.

Definition of Terms

Listeria monocytogenes: Gram-positive food pathogen, which may survive and grow at refrigeration temperature and may cause severe invasive disease (Yangchen et al., 2025).

Ready-to-Eat (RTE) Meat and Poultry Products: the foods that do not need any additional cooking and may be considered the high-risk products of contamination (World Health Organization, 2022).

Zero-Tolerance Policy: A regulatory practice that is adopted by FSIS and which prohibits the presence of detectable Listeria monocytogenes in ready-to-eat meat and poultry products (Food Safety and Inspection Service, 2014).

Chapter 2

Literature Review

This chapter systematically reviews Listeria monocytogenes, food safety regulation, and recall-based measures of regulatory effectiveness. It first addresses the significance of Listeria monocytogenes to societal health, then examines regulatory measures by the Food Safety and Inspection Service (FSIS), and finally analyzes recall trends as performance indicators.

It is possible to divide literature into three themes, which include (1) the significance of public health and the character of risks caused by the type of pathogens, (2) the regulatory framework and environmental control issues examined by FSIS, and (3) recall tendencies as the manifestations of regulatory efficiency. These themes were selected to gradually link the microbiological risk and regulatory design to quantifiable outcomes.

Theme 1: Public Health Significance and Risk Characteristics of Listeria monocytogenes

On the very general scale, food-borne diseases continue to cause significant levels of morbidity and mortality on the international scene. Food systems are still complicated sources of microbial hazards despite technological advancement and modernization of food regulations. A severe niche of this environment is linked to Listeria monocytogenes.

According to the World Health Organization (2022), invasive listeriosis is characterized by a high hospitalization rate and comparatively low incidence and case-fatality rates. It is this pathogenic severity that differentiates L. monocytogenes and other less dangerous but more widespread antigens, like Salmonella or Campylobacter.  The pathogen demonstrates a high level of clinical manifestations of listeriosis, such as septicemia, meningitis, and the possibility of the pathogen being transmitted to the fetus, which increases the overall health importance of the pathogen (Yangchen et al., 2025). Particularly, high risk is associated with vulnerable populations, such as pregnant women, neonates, the elderly, and immunocompromised groups. Therefore, it is not true that regulatory measures in respect of L. monocytogenes are merely precautionary; they should be strict, considering the consequences involved even with minimal exposure.

In addition to the severity of the clinical situation, biological peculiarities also make control more difficult. L. monocytogenes is a psychrotrophic organism; for instance, it can remain active and reproduce at refrigeration temperatures, unlike many foodborne pathogens. This ability essentially disputes the traditional cold-chain control strategies. By using quantitative microbiological risk assessment (QMRA) modelling, Hadjicharalambous et al. (2022) were able to demonstrate that long shelf-life and slight temperature variation increase the risk of exposure to even low initial contamination levels. Their Monte Carlo simulations show that the variability of refrigeration is interactive with the permeability of packaging and the length of storage to increase risk.

This observation highlights an important point: compliance with regulations at the production stage does not always eliminate downstream risk, particularly when environmental or storage conditions allow microbial growth. In that way, when the literature is reduced to the specifics of foodborne illnesses due to pathogen, one can see that L. monocytogenes poses structural control issues that require effective preventive mechanisms. Further narrowing to product-specific risk, ready-to-eat meat and poultry items represent particularly vulnerable vehicles. Compared to raw products, which are subjected to consumer cooking, the RTE foods do not have a final lethality process before they are served. Thus, contamination that takes place following thermal processing, otherwise known as post-lethality contamination, is a direct translation of exposure risk. International surveillance data consistently identify ready-to-eat (RTE) meat products as a recurring source of transmission (World Health Organization, 2022).

All in all, the literature brings out three critical epidemiological realities. To begin with, listeriosis is a serious clinical disorder that may have severe health outcomes, particularly in vulnerable groups. Secondly, Listeria monocytogenes exhibits high environmental resistance, thus it can survive and proliferate even in harsh conditions like refrigeration. Third, ready-to-eat (RTE) meat products are structurally high-risk vehicles since they are eaten without additional cooking. The combination of these elements indicates that the development of powerful and efficient regulatory mechanisms is required to regulate contamination and safeguard human health.

Theme 2: FSIS Regulatory Framework and Environmental Control Challenges

The literature changes direction as soon as the public health significance of L. monocytogenes control has been made; it focuses on the regulatory frameworks that mitigate the risk in the United States. In this regard, the Food Safety and Inspection Service (FSIS) regulates ready-to-eat (RTE) meat and poultry products. According to 9 CFR 430, the agency applies certain control requirements.

The Food Safety and Inspection Service (FSIS) requires facilities that process ready-to-eat meat and poultry to implement Hazard Analysis and Critical Control Point (HACCP) systems and Sanitation Standard Operating Procedures (Sanitation SOPs). Additionally, these facilities must maintain environmental monitoring programs and use approved post-lethality control measures. Moreover, FSIS has a zero-tolerance policy against detectable L. monocytogenes in RTE finished products. All these actions indicate a risk-based, preventive regulative philosophy.

Comparative regulatory studies indicate that the Listeria standards in the United States are one of the strictest in the international sphere (Zhang et al., 2021). The vertical structure, which involves industry preventive controls and federal inspection verification, appears extensive in design. The environmental sampling, corrective action requirements, and enforcement mechanisms are meant to avoid the entry of contaminated products into the market.

Nevertheless, the further the funnel extends beyond regulation design and into operational practice, the complexity of scientific literature comes in. It has been shown through whole-genome sequencing studies that certain L. monocytogenes strains can remain in processing environments over a long period, in some cases up to years (Kurpas et al., 2020). The presence of biofilm formation and adaptation to niches enables the organism to colonize the equipment surfaces and withstand sanitation measures.

Such a continuity introduces the conflict between regulatory anticipation and microbiological factuality. Although the implementation of environmental monitoring programs is mandatory, the success of such programs is determined by the intensity of sampling, coverage, the rigor of corrective actions, and the culture of sanitation at the establishment level. Even though regulations are adhered to, the elimination of environmental reservoirs might not be complete. Furthermore, QMRA results support the idea that even slight environmental violations can result in quantifiable escalations in personal health hazard (Hadjicharalambous et al., 2022). Therefore, compliance with regulation could minimise but not eradicate the chance of contamination.

The literature hence indicates that the regulatory framework has a scientific basis and is well structured. However, the aspects of environmental persistence and variation of operations provide possible implementation gaps. At this narrower point of focus, the question is no longer whether the regulatory design is adequate, but rather whether the regulatory performance is effective or ineffective.

Theme 3: Recall Trends as Indicators of Regulatory Effectiveness

The assessment at the bottom end of the funnel should shift the hypothetical regulatory design to an observable performance. Recall data gives a concrete measure of the performance of the system. Recalls are cases where the contaminated product was introduced into the market, leading to the provocation of regulatory actions. Though the recalls can be a sign of effective detection models, repeated trends can also be an indicator of the system’s weakness. The frequency of recalls, classification (Class I versus Class II), product category recurrence, and cited source of contamination analysis gives an understanding of whether the regulatory controls are effective at all times in preventing contamination or whether structural deficiencies are still present.

As observed by Yangchen et al. (2025), even in the most regulated jurisdictions, recalls still take place, implying that the presence of regulation does not make the risk disappear. In a similar vein, Zhang et al. (2021) recognize that outbreaks and recalls continue regardless of organized preventive models. Nevertheless, recall trend data and regulatory design assessment are not often combined in the literature in a systematic way. A majority of the studies address microbiological characterization, outbreak investigation, or policy description alone. Few integrate pathogen biology, regulatory requirements, environmental persistence, and recall outputs under a single evaluator system.

Such a lack of integrative regulatory outcomes analysis is a great gap in practical food safety studies. In the absence of trend evaluation of longitudinal recall, it is not known whether recurring events of contamination represent:

• Unavoidable biological danger of complex food systems,
• Random error in the level of establishment implementation,
• Weaknesses in the level of verification or sampling scheme, or
• Structural regulatory constraints which are not well handled through existing policy mechanisms.

The literature narrows to recall trends as outcome indicators which identify the requirement of regulatory science evaluation that addresses the gap between policy intent and empirical evidence.

Synthesis and Identification of the Gap

Through the three themes, the literature creates a consistent yet incomplete story. On the most general level, Listeria monocytogenes has an extreme and disproportional impact on public health. Reduced to the product context, RTE meat and poultry products are structurally weak vehicles. Sub-narrowing down to regulatory design, FSIS has very strict preventive measures that are backed by zero-tolerance enforcement and monitoring of the environment. However, research on environmental persistence proves that there is biological resilience that makes eradication difficult. Lastly, factual records indicate that the occurrence of contamination is still persistent despite regulation.

What has not been answered satisfactorily is whether we can find any recall patterns to indicate the variability of regulation implementation or the structural constraint of the existing control strategies. The current literature is far-reaching in terms of defining risk and regulation, but lacks synthesis on how regulatory design is connected to longitudinal outcome measures.

This loophole highlights the necessity to have a trend analysis of recalls organized and combined with the analysis of regulatory frameworks. The investigation of recall frequency, classification, and contamination context relative to existing regulatory controls can be used to determine whether the current FSIS measures translate into quantifiable health protection for the population.

When transferring the general epidemiology issue to a narrow regulatory performance analysis, the funnel approach shows the key gap to be addressed in the research: a systematic analysis of whether repeated Listeria recalls indicate implementation gaps in the otherwise comprehensive regulatory framework.

Chapter 3

Method

The chapter gives the technique applied in determining the effectiveness of regulatory measures in avoiding Listeria monocytogenes contamination of RTE meat and poultry products. It provides the steps involved in the literature review and the systematic review of the recall data available from FSIS. The chapter discusses the data sources, criteria employed to select the data, and analytical procedures employed to achieve consistency and reliability. It also states how the applied project element works and the distinction between independent data analysis by the researcher and literature review.

Review of the Background Literature

After covering the Background Literature Review, this chapter provides the methodology to systematically analyze regulatory effectiveness and recall trends associated with Listeria monocytogenes in ready-to-eat (RTE) meat and poultry products. Chapter 3 describes the literature search strategy, inclusion and exclusion criteria, data extraction procedures, and the method that will be used to analyze the data from Food Safety and Inspection Service recalls and outbreak summaries. This methodological framework aims to provide transparency, reliability, and consistency in the alignment of the research questions of the study and the regulatory evidence being examined.

Databases searched include:

• Arizona State University Library
• PubMed
• Elsevier ScienceDirect
• National Library of Medicine
• Google Scholar
• SpringerLink

The following keyword combinations were used with publication date filters (2018–2025 unless seminal source):

• “Listeria monocytogenes” AND “ready-to-eat meat”
• “Listeria monocytogenes” AND “FSIS regulation”
• “post-lethality contamination” AND “RTE meat”
• “Environmental persistence” AND “Listeria monocytogenes”
• “Listeria recall” AND “meat and poultry”
• “Regulatory effectiveness” AND “food safety”
• “Zero tolerance policy” AND “Listeria monocytogenes”

Inclusion Criteria:

• Peer-reviewed articles
• English language
• RTE meat/poultry focus
• Regulatory relevance

Exclusion Criteria:

• non-meat commodities
• non-peer-reviewed commentaries
• Studies lacking a regulatory context

Table 1

Literature Search and Screening Summary

Stage of Literature Review	Number of Articles
Initial database yield	52
After title/abstract screening	31
After full-text eligibility review	18
Final studies included in synthesis	11

Regulatory Recall Trend Analysis

Data Source

• FSIS Recall Case Archive (2018–2025)
  • FSIS annual recall summaries
  • CDC outbreak summaries (where applicable)

Data Extracted

• Year of recall
• Recall classification
• Product category
• Cause of contamination
• Volume recalled

All recall cases meeting the inclusion criteria were compiled into a structured dataset for analysis. Table 2 shows that this data forms the empirical basis for this research. The dataset was built from the FSIS Recall Case Archive, with information added from official FSIS recall notices and annual summaries from 2018 to 2025. All entries were included based on relevance to Listeria monocytogenes contamination in RTE meat and poultry products. The analysis used these matched recall cases to identify patterns in recall frequency, classification, product type, and contamination situations. This dataset was used for the results presented in Chapter 4.

Table 2: Detailed FSIS RTE Listeria monocytogenes Recall Dataset (2018–2025)

Recall ID	Date	Product (RTE Meat/Poultry)	Approx. Pounds Recalled	Classification	Source
—	2018	Multiple RTE meat recalls due to Listeria monocytogenes were identified in the annual recall summary (not individually listed)	4,127,696 lbs (total Listeria recalls in 2018)	Various	FSIS Annual Recall Summary 2018
023-2024	Jul 26 2024	Boar’s Head RTE liverwurst & other deli meats due to L. monocytogenes	~207,528 lbs	Class I	FSIS archive recall notice
023-2024-EXP	Jul 30 2024	Boar’s Head expands recall to RTE meat/poultry products due to L. monocytogenes	~7,000,000+ lbs (expansion)	Class I	FSIS archived recall update
028-2024	Oct 9 2024	BrucePac RTE meat and poultry products due to L. monocytogenes contamination	~9,986,245 lbs (initial)	Class I	Official FSIS recall release
028-2024-EXP	Oct 15 2024	BrucePac RTE meat and poultry products recall expanded	~11,765,285 lbs (expanded)	Class I	Official FSIS updated release
—	Nov 9 2024	Yu Shang Food, Inc. RTE meat and poultry products due to L. monocytogenes	~60,020 lbs	Class I (inferred)	Official FSIS recall notice
—	2025	Bourgeois Smokehouse RTE smoked andouille sausage products due to L. monocytogenes	~100 lbs	High-risk	Listed on the FSIS recalls page (Listeria)

Data Analysis Procedure

This project involved a separate analysis of the recall data provided by the Food Safety and Inspection Service (FSIS) Recall Case Archive. First, the recall cases related to Listeria monocytogenes in RTE meat and poultry products were identified from 2018 to 2025. The records of recalls were all checked by hand to confirm that the necessary information met the research criteria and that only meat and poultry products regulated by FSIS were enrolled in the study. Each recall notice was analyzed systematically to extract relevant variables. These variables included recall date, product type, recall classification (e.g., Class I), estimated amount of product recalled, and the stated reason for contamination. In recall expansions, they were associated with the initial recall and were considered a continuation of the same contamination.

After extracting the data, the recall cases were organized by time to detect temporal trends in contamination events. An analysis of the dataset was followed by descriptive analytical measures to determine:

• Annual recall frequency
• Trends in Class I recalls
• Recall expansion indicators
• Recurrence within product categories
• Indications of post-lethality contamination

Analysis was done to reveal patterns, not to establish causal relationships. The observed trends were then contrasted with the regulatory framework outlined in the literature review to determine whether the recurrence of recall instances can be interpreted as a sign of a regulatory enforcement or verification loophole.

Reliability and Validity

The reliability of the study was enhanced by an explicit record of the databases utilized, clear inclusion criteria, and clear procedures of data extraction. The validity was also improved through alignment of the research questions with the important themes in the literature. Besides this, official FSIS recall data were also taken as outcome measures in order to confirm and validate the findings.

Bias in Research

The possibility of confirmation bias was mitigated through structured inclusion criteria used in the selection of the literature. Furthermore, the description and the objective method of recall data interpretation were employed to ensure that there would be no selective interpretation. This procedure was used in order to make sure that the results were premised on uniform and open-minded analysis.

Ethical Considerations

The proposed project will use only accessible regulatory data that can be found publicly and will not require human subjects. Therefore, ethical risks are minimal. As a result, the authorization of the Institutional Review Board was not necessary.

 Chapter 4

Results

This study aimed to assess the effectiveness of the Food Safety and Inspection Service (FSIS) regulatory program in preventing Listeria monocytogenes contamination in ready-to-eat meat and poultry facilities. To meet this goal, the study addressed three main questions:

1. What are the regulatory controls that FSIS uses to control Listeria monocytogenes in RTE meat and poultry products?
2. What patterns are observable in FSIS Listeria-related recalls between 2018 and 2025?
3. Are there indications of regulatory or implementation loopholes in the recall patterns?

Patterns were identified in the FSIS Recall Case Archive (2018-2025) using a structured approach. Recall information was automatically retrieved and ordered chronologically. Variables considered were recall year, recall type (e.g., Class I or II), product type, suspected cause, and recalled volume.

The variables were descriptively analyzed to identify trends in the dataset. Trends were observed in recall frequency per year, number of high-risk groups, recurrence of specific product groups, and recall expansions following initial notifications. Focus was given to post-lethality contamination, as indicated in recall justifications. The analysis compared these variables over time and across scales to determine whether contamination cases were isolated or part of a broader pattern under FSIS regulations.

This analysis is presented in the sections below, starting with an overview of FSIS regulatory controls and then discussing the longitudinal recall patterns identified in the data. This chapter concludes with trends identified in the recall data that may reflect potential implementation challenges in the food safety system.

Regulatory Controls Used by FSIS to Prevent Listeria monocytogenes

The literature reviewed in this paper revealed some of the regulatory measures employed by FSIS to avoid contamination of Listeria monocytogenes in ready-to-eat meat and poultry products. These are aimed at preventing contamination before delivery to the consumer and identifying contamination at an early stage when it arises. The regulating system is based on preventive regulations, sanitary processes, and surveillance measures to sustain food safety in federally inspected establishments (Food Safety & Inspection Service, 2014).

Hazard Analysis and Critical Control Point (HACCP) systems are one of the most crucial regulatory requirements. HACCP requires the establishments to define possible biological hazards and set up points of control in the production process to avoid contamination. This solution enables facilities to track the risk of food safety all the time and take corrective measures in case of deviations (Codex Alimentarius Commission, 2020).

The other vital element of the regulatory framework is the Sanitation Standard Operating Procedures (Sanitation SOPs). Such procedures outline the cleaning and sanitation processes that establishments should abide by in order to maintain clean processing environments. Proper sanitation can reduce bacterial contamination in the food contact surfaces, equipment and processing areas (FSIS, 2014).

Listeria monocytogenes also tends to be controlled by the use of environmental monitoring programs in the ready-to-eat food production environment. The programs compel establishments to examine food contact surfaces and other environmental areas around them on a regular basis, to determine whether they are contaminated with Listeria species. In cases where contamination has been identified, the facilities are required to implement corrective measures, which may include environmentally upgraded sanitation and additional verification tests (Tompkin, 2002).

FSIS also implements a zero-tolerance policy towards detectable Listeria monocytogenes in finished ready-to-eat meat and poultry products. Regulatory action can be taken, such as the recall of products, in case the pathogen is found in a finished product. Such a high requirement is based on the severe consequences of listeriosis on the population, especially pregnant women, the elderly, and those whose immune systems are compromised (Centers for Disease Control and Prevention, 2023).

Observed Patterns in Listeria Recall Events

The second purpose of the research was to investigate recall patterns of Listeria monocytogenes contamination of ready-to-eat meat and poultry products. The FSIS Recall Case Archive was searched to gather recall records, which were sorted by date to determine trends with regard to the rate of recall, product category, and magnitude of recalls. These documents had a lot of useful information on the occurrence of contamination incidents in the controlled food system.

The data on the recalls showed that the Listeria-related recalls happened periodically in the food supply controlled by the FSIS. To illustrate this argument, the FSIS annual recall summary indicated that there were over four million pounds of ready-to-eat meat products recalled in 2018 due to the potential Listeria monocytogenes contamination (FSIS, 2018). This massive recall shows just how big contamination incidents can be and the need for regulatory vigilance.

The dataset that was used in the context of this study identified several major recalls in 2024. A case in point was Boar’s Head ready-to-eat deli meat products, whereby initially, a recall was done after the possibility of contamination was found. The recall started with around 207,528 pounds of product and then extended to over seven million pounds of ready-to-eat meat products.

In October 2024, another massive recall incident involved BrucePac ready-to-eat meat and poultry products. Almost ten million pounds of the product were first recalled and later extended to over eleven million pounds after further investigation. Large scope recalls like this show how the incidences of contamination can escalate to a larger extent as regulatory investigations progress.

It was also found that smaller recall events existed in the dataset. For instance, Yu Shang Food Inc. recalled some 60,020 pounds of ready-to-eat meat products due to potential contamination issues. In 2025, Bourgeois Smokehouse recalled the smoked sausage products due to possible contamination with Listeria monocytogenes.

These incidents demonstrate that contamination incidents can be of different magnitudes. Other recalls are comparatively small batches of products, whereas others are millions of pounds of ready-to-eat food products shipped to various regions. The difference in scale of recall shows the significance of the timely detection system and the effective regulatory response.

Summary of Recall Trends Identified in the Data

In order to gain a deeper insight into the general nature of the contamination incidents, the recall data were summarized to determine recurring themes throughout the period. The data analysis was done by paying attention to the recall type, product types used, and the magnitude of contamination events. The identification of these patterns aids in achieving a better picture of the risk of contamination in the ready-to-eat meat production systems.

Among the key findings obtained through the dataset is the fact that the majority of the recall events were recalls that fell into Class I. A Class I recall implies a case whereby one can reasonably suspect that exposure to the product may lead to severe health effects or even death (FSIS, 2023). This classification points out how serious the Listeria monocytogenes contamination of ready-to-eat foods can be.

A second trend in the data on recall is that ready-to-eat meat and processed poultry products are typically involved. All these foods are normally eaten without any additional cooking, a factor that elevates the risk of contamination to the health of the populace. Consequently, regulatory bodies are highly concerned with the regulation of Listeria monocytogenes in these types of products (Tompkin, 2002).

According to the records of recalls, it is also mentioned that some of the recall events were extended following the initial notification. Recall expansions tend to happen when new contaminated items are discovered during the regulatory investigations. These expansions imply that the cases of contamination can occasionally be larger than originally observed.

The major recall trends identified during the analysis are summarized in Table 3.

Table 3

Summary of Observed FSIS Listeria Recall Patterns in Ready-to-Eat Meat and Poultry Products (2018–2025)

Analytical Category	Observation from Recall Data
Study period	2018-2025
Number of major recall events identified	6 major recall events
Largest recall event	BrucePac recall expansion (~11.7 million pounds)
Smallest recall event	Bourgeois Smokehouse smoked sausage (~100 pounds)
Most common recall classification	Class I recalls
Most frequently affected products	Ready-to-eat deli meats and processed poultry
Evidence of recall expansion	Multiple recalls expanded after initial announcement
Likely contamination source	Post-lethality contamination in processing environments

Indicators of Possible Implementation Challenges

The recall trends in the data set indicate that contamination incidents still happen despite intense regulatory control. The very presence of recalls cannot be regarded as the failure of the regulatory system. Nevertheless, consecutive food contamination incidents can indicate difficulties in implementing food safety measures in processing plants.

Post-lethality contamination is one of the prevalent sources of contamination in ready-to-eat meat products. These products are normally cooked thoroughly as part of their processing, and this kills dangerous pathogens. The contamination can then follow when the product itself gets in contact with contaminated equipment, surfaces, or environmental sources in the facility (Tompkin, 2002).

The other problem is that Listeria monocytogenes can survive and grow at refrigeration temperatures. Listeria can grow in cold conditions that are typically employed during storing food, unlike many other foodborne pathogens. This feature enables the pathogen to survive in food processing settings and poses greater risks of contamination in the long term (CDC, 2023).

The recall information, hence imply that environmental persistence of Listeria monocytogenes is a major food safety issue in ready-to-eat meat processing systems. Proper sanitation campaigns, surveillance and rigorous regulatory control are the key tools in managing contamination. These measures need to be enforced further in order to minimize the threat of future outbreaks.

 Chapter 5

Discussion

In Chapter 5, the discussion of the reported findings in Chapter 4 will take place. The findings of the study are interpreted in this chapter in terms of the research questions and the available literature on Listeria monocytogenes control in ready-to-eat meat and poultry products. The chapter also reviews the way that the findings suggest the efficacy of existing regulatory controls by the Food Safety and Inspection Service (FSIS). The chapter will also examine the implications of the findings regarding food safety regulation and areas that might need further monitoring or enhancement.

The purpose of this study was to assess how well the Food Safety and Inspection Service (FSIS) was able to stop Listeria monocytogenes from getting into ready-to-eat (RTE) meat and poultry products. The study’s purpose was accomplished, as the results delineated essential regulatory controls, recall trends, and possible implementation obstacles. This chapter talks about these findings in relation to the research questions and the pre-existing literature. It also explains why they are important for food safety practice.

This chapter is structured around the three research questions that direct the study. Each part talks about the results and how they relate to the research that was done in the previous chapters. This method makes sure that the results are consistent and makes it easy to see how they fill the identified research gap.

Research Question 1: Regulatory Controls Used by FSIS

The results showed that FSIS has a complete set of rules that it uses to keep Listeria monocytogenes out of ready-to-eat meat and poultry products. These controls include Hazard Analysis and Critical Control Point (HACCP) systems, cleaning procedures, programs for monitoring the environment, and a strict policy against pathogens in finished products. These results are in tandem with what other researchers have found, which stresses the need for preventive food safety systems to keep microbial hazards in check (Tompkin, 2002).

The results also follow FSIS regulations, which support the idea that keeping things clean and watching the environment are two of the best ways to keep Listeria monocytogenes in check. According to studies conducted by FSIS (2014), businesses must always check their food safety systems and fix any problems they find. This supports the idea that regulatory controls are meant to stop and find contamination in places where food is processed.

However, the results suggest that the effectiveness of these controls would depend on their consistent use. Previous research proves that food safety outcomes can be affected by the discrepancy between sanitation practices and monitoring procedures (Codex Alimentarius Commission, 2020). Nonetheless, even though the rules are strict, their success depends on how well they are followed in real life.

Research Question 2: Patterns in FSIS Listeria-Related Recalls (2018–2025)

The results showed that the Listeria monocytogenes recalls still happen within the FSIS-regulated system. It had several massive recalls, particularly in 2024, which involved millions of pounds of ready-to-eat meat and poultry products. These results show that contamination can still take place in circumstances where there is strict government surveillance.

Such findings are consistent with other studies that show that Listeria monocytogenes remains a major food safety hazard. The pathogen may live in food preparation locations and be transmitted by contaminated surfaces and equipment (Centers for Disease Control and Prevention [CDC], 2023). This is why even controlled systems can experience massive recalls.

The other significant trend was the increase in recalls following the initial announcements. This implies that cases of contamination may not be realised at an initial stage. Similar findings are reported in the literature, which states that the process of identifying sources of contamination can be complicated and might need continuous research (Tompkin, 2002).

Research Question 3: Indications of Regulatory or Implementation Loopholes

Following the observed results, it is safe to conclude that certain issues can emerge with regard to applying regulatory controls. Post-lethality contamination is one of the greatest challenges witnessed, and it occurs after the cooking process when the products are exposed to contaminated environments and surfaces. This kind of contamination has been well known as a significant source of Listeria monocytogenes in ready-to-eat foods (Tompkin, 2002).

The other grave issue is the ability of the Listeria monocytogenes to survive and grow under refrigeration temperatures. The ability of the pathogens to withstand these extreme conditions enables them to survive in processing environments and pose additional risks of further contamination with time. This, according to the studies done by the CDC (2023), makes Listeria especially hard to control, unlike other foodborne pathogens.

Such findings prove that while regulatory controls are sturdy in design, there are higher chances of existing gaps in their implementation. Environmental persistence and inconsistent sanitation practices can play a critical role in recurring contamination events. This is a clear indication of the need to come up with more stringent enforcement and enhanced facility-level practices.

Integration with the Research Gap

Based on the findings of this study, one can confidently state that this study directly addresses the research gap identified in earlier chapters. The study aimed to determine whether regulatory controls are effective in preventing Listeria monocytogenes contamination. Although the results indicate the presence of strong regulatory systems, contamination events still take place.

This is a clear indication that the gap lies not in the design of regulations but in their practical implementation. The results strongly correlate with the literature, which highly recommends the significance of environmental monitoring and sanitation. Nevertheless, the ever-occurring recalls prove that these measures may not always be fully effective in real-world situations.

Future Research Directions

In the coming days, research should concentrate on improving the enforcement of regulatory controls in food processing settings. Research should look into how different facilities use sanitation and monitoring practices and find out what makes things work better. This would give us useful ways to make food safer.

Another area for future research is the creation of better ways to detect Listeria monocytogenes. Faster ways to find contamination could help find it sooner and cut down on the number of recalls. This would make food safer and the government more responsive.

Research could also look into how training employees and following the rules affect food safety systems. Knowing how human factors affect monitoring and sanitation practices could help make regulations work better. This would be a more complete way to stop contamination.

Limitations and Delimitations

There are a few limitations associated with this study that need to be carefully considered. For instance, the analysis depended on publicly accessible recall data, which might not encompass all contamination incidents. Some incidents might go unreported or might not lead to recalls.

Also, the study was solely restricted to ready-to-eat meat and poultry products regulated by FSIS. This indicates that the results may not be relevant to other food sectors. Also, the study only looked at the years 2018 to 2025, which may not show long-term trends.
However, despite these limitations, the study gives us useful information about regulatory controls and how recalls work. The defined scope helped keep everyone on track and made it possible to look closely at the research questions. These boundaries made the findings more useful.

Real-World Implications

The results of this study have significant consequences for food safety practices. Better enforcement of regulatory controls could lower the risk of contamination in ready-to-eat meat and poultry products. This shows how important it is to have good sanitation and monitoring systems.

The study also stresses the importance of ongoing regulatory oversight and enforcement. Following food safety rules is important for keeping people healthy. These results can help improve food safety rules and practices.

Conclusion

The article evaluated the effectiveness of regulatory measures used by the Food Safety and Inspection Service (FSIS) to control Listeria monocytogenes contamination of ready-to-eat (RTE) meat and poultry products. The research concentrated on three significant areas: the regulatory considerations, the trends in the recalls between 2018 and 2025, and the potential lapses during the implementation. The findings of this study provide a concise picture of the work of the regulatory system and what barriers might still exist.

The results showed that FSIS has established a strong regulatory framework to control Listeria monocytogenes. The significant strategies are Hazard Analysis and Critical Control Point (HACCP) systems, sanitation policies, environmental monitoring policies, and a zero-tolerance policy to the pathogen in finished products. The purpose of such measures is to get rid of contamination and to ensure that dangerous products are not produced and supplied to consumers.

Although these are very stringent regulatory measures, the study established that there are still instances of contamination within the food system. The study identified several recalls within the time frame, such as massive recalls of millions of pounds of ready-to-eat meat and poultry products. These results indicate that the system is effective at detecting contamination, but prevention is not always an absolute goal.

The study also had some important patterns in terms of recall events. Most of the recalls were classified as high-risk, and most of the recalled products were ready-to-eat deli meats and processed poultry products. Also, recalls were not announced initially, which means that the contamination is not always disclosed early.

The other important observation is that post-lethality contamination is a critical issue. It occurs when the products have been cooked after coming in contact with contaminated surfaces or environments. The capacity of Listeria monocytogenes to withstand low temperatures further aggravates the chances of food processing plant contamination.

Overall, the study concludes that the FSIS regulatory controls are of high quality but require implementation to be fully operational. The fact that the recalls have continued implies that the facility level requires more focus, particularly in the area of sanitation and environmental monitoring. By enhancing these aspects, it would be possible to minimize the risk of contamination and increase the quality of food safety results.

The article assists the study of food safety because it provides a bit of insight into how regulatory systems operate in the real-world setting. It stresses both the importance of harsh rules and their enforcement. The findings can be utilized to make changes in food safety practices in the future and support the current efforts to protect human health.

References

Centers for Disease Control and Prevention. (2023). Listeria (Listeriosis). https://www.cdc.gov/listeria

Codex Alimentarius Commission. (2020). General principles of food hygiene CXC 1-1969. FAO/WHO.

Food Safety and Inspection Service. (2014). FSIS compliance guideline: Controlling Listeria monocytogenes in post-lethality exposed ready-to-eat meat and poultry products. USDA.

Food Safety and Inspection Service. (2018). FSIS recall summaries. USDA.

Food Safety and Inspection Service. (2023). FSIS recall classifications. USDA.

Hadjicharalambous, C., Grispoldi, L., Chalias, T., & Cenci-Goga, B. (2022). A quantitative risk assessment of Listeria monocytogenes from prevalence and concentration data: Application to a traditional ready-to-eat (RTE) meat product. International Journal of Food Microbiology, 379, 109843. https://doi.org/10.1016/j.ijfoodmicro.2022.109843

Kurpas, M., Osek, J., Moura, A., Leclercq, A., Lecuit, M., & Wieczorek, K. (2020). Genomic characterization of Listeria monocytogenes isolated from ready-to-eat meat and meat processing environments in Poland. Frontiers in Microbiology, 11, 1412.  https://doi.org/10.3389/fmicb.2020.01412

Tompkin, R. B. (2002). Control of Listeria monocytogenes in the food-processing environment. Journal of Food Protection, 65(4), 709–725.

World Health Organization. (2022). Listeria monocytogenes in ready-to-eat (RTE) food: attribution, characterization and monitoring: meeting report (No. CC2400EN/1/10.22). Food and Agriculture Organization of the United Nations. https://openknowledge.fao.org/server/api/core/bitstreams/b1eb7636-6a33-4c43-97c4-2769ccb09eb8/content

Yangchen, J., Sarkar, D., Rood, L., Vaskoska, R., & Kocharunchitt, C. (2025). Listeria monocytogenes: A Continuous Global Threat in Ready-to-Eat (RTE) Foods. Foods, 14(21), 3664. https://doi.org/10.3390/foods14213664

Zhang, X., Wang, S., Chen, X., & Qu, C. (2021). Review controlling Listeria monocytogenes in ready-to-eat meat and poultry products: An overview of outbreaks, current legislations, challenges, and future prospects. Trends in Food Science & Technology, 116, 24–35.  https://doi.org/10.1016/j.tifs.2021.07.014

Appendices

Table 1: Literature Search and Screening Summary

Stage of Literature Review	Number of Articles
Initial database yield	52
After title/abstract screening	31
After full-text eligibility review	18
Final studies included in synthesis	11

 

Table 2: Detailed FSIS RTE Listeria monocytogenes Recall Dataset (2018–2025)

Recall ID	Date	Product (RTE Meat/Poultry)	Approx. Pounds Recalled	Classification	Source
—	2018	Multiple RTE meat recalls due to Listeria monocytogenes were identified in the annual recall summary (not individually listed)	4,127,696 lbs (total Listeria recalls in 2018)	Various	FSIS Annual Recall Summary 2018
023-2024	Jul 26 2024	Boar’s Head RTE liverwurst & other deli meats due to L. monocytogenes	~207,528 lbs	Class I	FSIS archive recall notice
023-2024-EXP	Jul 30 2024	Boar’s Head expands recall to RTE meat/poultry products due to L. monocytogenes	~7,000,000+ lbs (expansion)	Class I	FSIS archived recall update
028-2024	Oct 9 2024	BrucePac RTE meat and poultry products due to L. monocytogenes contamination	~9,986,245 lbs (initial)	Class I	Official FSIS recall release
028-2024-EXP	Oct 15 2024	BrucePac RTE meat and poultry products recall expanded	~11,765,285 lbs (expanded)	Class I	Official FSIS updated release
—	Nov 9 2024	Yu Shang Food, Inc. RTE meat and poultry products due to L. monocytogenes	~60,020 lbs	Class I (inferred)	Official FSIS recall notice
—	2025	Bourgeois Smokehouse RTE smoked andouille sausage products due to L. monocytogenes	~100 lbs	High-risk	Listed on the FSIS recalls page (Listeria)

Table 3

Summary of Observed FSIS Listeria Recall Patterns in Ready-to-Eat Meat and Poultry Products (2018–2025)

Analytical Category	Observation from Recall Data
Study period	2018-2025
Number of major recall events identified	6 major recall events
Largest recall event	BrucePac recall expansion (~11.7 million pounds)
Smallest recall event	Bourgeois Smokehouse smoked sausage (~100 pounds)
Most common recall classification	Class I recalls
Most frequently affected products	Ready-to-eat deli meats and processed poultry
Evidence of recall expansion	Multiple recalls expanded after initial announcement
Likely contamination source	Post-lethality contamination in processing environments

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