Food Safety & Foodborne Health

Food safety and foodborne health are central components of public health, veterinary medicine, agriculture, and global food systems. Every year, millions of people become ill after consuming contaminated food, with consequences ranging from mild gastrointestinal disease to severe systemic infections, long-term health complications, hospitalization, and death. Foodborne diseases affect individuals, families, healthcare systems, food industries, and international trade, making food safety a shared responsibility across human, animal, and environmental sectors.

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The science of food safety extends far beyond preventing spoiled food. Modern food systems involve complex interactions among farms, animals, crops, processing facilities, transportation networks, retailers, food-service establishments, and consumers. At every stage of this chain, biological hazards can enter, survive, or spread if adequate safeguards are not in place. Research consistently shows that foodborne pathogens remain among the most important and persistent public-health threats worldwide (Kirk et al., 2015; Walter et al., 2025).

As part of the CountryVetMom Veterinary Knowledge System, this pillar provides an evidence-based introduction to food safety and foodborne health from a One Health perspective. It serves as a hub connecting key topics related to foodborne pathogens, food contamination, surveillance, prevention, and public health.

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What This Major Pillar Covers

 

This major pillar examines how foodborne diseases emerge, how foodborne pathogens move through food systems, and how prevention strategies protect both human and animal populations.

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Topics covered include:

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• Foodborne bacterial pathogens

• Foodborne viral pathogens

• Foodborne parasitic pathogens

• Food contamination pathways

• Farm-to-fork food safety

• Food hygiene and sanitation

• Surveillance and outbreak detection

• Emerging foodborne risks

• Antimicrobial resistance in food systems

• Veterinary public health and food safety

• One Health approaches to prevention

 

This pillar also serves as a gateway to more specialized educational resources that explore individual pathogens, transmission routes, surveillance systems, and prevention frameworks in greater depth.

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Why This Area Matters

 

Foodborne diseases represent one of the most widespread public-health challenges globally. According to estimates from the World Health Organization, contaminated food caused approximately 582 million illnesses and 25.2 million disability-adjusted life years (DALYs) worldwide in 2010, with the greatest burden occurring among young children and populations in lower-resource regions (Kirk et al., 2015).

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The burden extends beyond acute illness. Foodborne infections can lead to hospitalization, chronic complications, economic losses, reduced productivity, food recalls, and disruptions in trade and food security (Gallo et al., 2020; Tibebu et al., 2024).

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In the United States alone, seven major foodborne pathogens were estimated to cause approximately 9.9 million domestically acquired illnesses, more than 53,000 hospitalizations, and over 900 deaths in 2019. Norovirus accounted for the largest number of illnesses, while Salmonella remained a leading cause of severe disease and mortality (Walter et al., 2025).

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Food safety is therefore not merely a food-production issue. It is a public-health issue, an agricultural issue, an environmental issue, and a veterinary issue. Effective prevention requires cooperation among producers, veterinarians, food scientists, public-health agencies, regulators, industry stakeholders, and consumers.

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How This Major Pillar Relates to One Health & Public Health

 

Foodborne health is one of the clearest examples of the One Health concept in practice.

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One Health recognizes that the health of people, animals, and the environment is interconnected. Foodborne pathogens frequently move across these interfaces. Many important foodborne organisms originate in animals, survive in environmental reservoirs, contaminate crops or food products, and ultimately infect humans through food consumption (Abebe et al., 2020; Rodríguez-Melcón et al., 2024).

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Animal production systems, wildlife, water resources, soil, food-processing environments, and human handling practices all influence food safety outcomes. As a result, prevention efforts must consider the entire food chain rather than focusing on a single stage.

Research increasingly supports integrated One Health strategies that combine:

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• Veterinary surveillance

• Human disease surveillance

• Environmental monitoring

• Food-chain risk assessment

• Antimicrobial resistance monitoring

• Farm-to-fork food safety programs

 

These approaches improve outbreak detection, strengthen prevention systems, and support more effective public-health responses (Beshearse et al., 2021; Rodríguez-Melcón et al., 2024).

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Readers who are new to this framework may wish to begin with the broader system page: One Health & Public Health Overview

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Key Concepts Within This Pillar

 

Understanding food safety and foodborne health requires familiarity with several foundational concepts.

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Foodborne Disease

 

Foodborne disease refers to illness resulting from consumption of contaminated food. Contamination may involve bacteria, viruses, parasites, toxins, or other biological hazards capable of causing disease (Adley & Ryan, 2016).

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Foodborne Pathogens

 

Foodborne pathogens are disease-causing microorganisms transmitted through food. These organisms include bacteria such as Salmonella and Campylobacter, viruses such as Norovirus and Hepatitis A virus, and numerous foodborne parasites (Bintsis, 2017; Koutsoumanis et al., 2018).

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Food Contamination

 

Food contamination occurs when harmful biological agents enter food during production, processing, transportation, storage, preparation, or serving. Contamination can occur at multiple points throughout the food chain (Alegbeleye et al., 2018).

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Farm-to-Fork Food Safety

 

Farm-to-fork food safety recognizes that food safety depends on coordinated controls throughout the entire food-production continuum, from agricultural production to final consumption (Schirone et al., 2019).

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Food Safety Surveillance

 

Surveillance systems monitor foodborne diseases, identify outbreaks, track trends, and support public-health interventions. Modern surveillance increasingly incorporates advanced laboratory technologies and genomic tools (Tack et al., 2020; Aladhadh, 2023).

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Antimicrobial Resistance

 

Some foodborne pathogens have developed resistance to antimicrobial drugs, creating challenges for both human and veterinary medicine. Antimicrobial resistance has become an important One Health concern across food systems (Kureljušić et al., 2021; Rossi et al., 2025).

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Foodborne Pathogens

 

Foodborne pathogens are microorganisms capable of causing disease when transmitted through contaminated food. They represent the biological hazards responsible for most recognized foodborne illnesses worldwide and remain a major focus of public-health surveillance, food-safety regulation, and veterinary public health research (Gourama, 2020; Shi & Kang, 2024).

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Learn more in our guide to Foodborne Pathogens.

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Foodborne pathogens are commonly grouped into three broad categories:

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Foodborne Bacteria

 

Bacteria remain the most extensively studied and best-characterized foodborne hazards. Important bacterial pathogens include:

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• Salmonella

• Campylobacter

• Escherichia coli (E. coli)

• Listeria monocytogenes

• Staphylococcus aureus

 

These organisms can contaminate animal-derived foods, fresh produce, water sources, processing environments, and ready-to-eat products. Many bacterial pathogens possess complex transmission pathways that involve animals, environmental reservoirs, and human food-handling activities (Abebe et al., 2020; Ali & Alsayeqh, 2022).

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Among bacterial foodborne pathogens, Salmonella and Campylobacter consistently rank among the leading causes of disease globally, while certain pathogenic strains of E. coli are associated with severe outbreaks and significant public-health consequences (Walter et al., 2025; Ekici & Dümen, 2019).

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Foodborne Viruses

 

Viruses are increasingly recognized as major contributors to foodborne disease burden. Unlike bacteria, viruses cannot multiply in food itself, but contaminated foods can efficiently transmit infection to humans.

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Important foodborne viruses include Norovirus and Hepatitis A virus (primarily transmitted via human fecal contamination of food or water) and Hepatitis E virus (a notable zoonotic pathogen primarily linked to swine reservoirs and undercooked pork products). 

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Norovirus is responsible for a substantial proportion of foodborne illnesses in many countries and is frequently linked to outbreaks associated with contaminated foods and infected food handlers (Walter et al., 2025; Al-Daim, 2022).

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Despite their importance, viral foodborne hazards remain less extensively studied than bacterial pathogens, creating significant knowledge gaps in surveillance, detection, and burden estimation (Newell et al., 2010; Aladhadh, 2023).

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Foodborne Parasites

 

Foodborne parasites represent another important but comparatively understudied group of hazards. These organisms can be transmitted through contaminated meat, fish, produce, and water.

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Research evaluating global disease burden has shown that foodborne parasitic diseases contribute substantially to morbidity in many regions of the world, although surveillance and reporting remain inconsistent (Torgerson et al., 2015; Koutsoumanis et al., 2018).

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Compared with bacterial pathogens, foodborne parasites receive less surveillance attention and are frequently underdetected, creating uncertainty regarding their true burden and geographic distribution (Newell et al., 2010).

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How Foodborne Pathogens Move Through Food Systems

 

Foodborne pathogens can enter foods at numerous stages throughout the production chain. Sources include:

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• Animal reservoirs

• Contaminated water

• Soil contamination

• Wildlife exposure

• Processing environments

• Transportation systems

• Food handlers

• Retail environments

 

Fresh produce presents unique challenges because contamination can occur before harvest through irrigation water, soil amendments, wildlife contact, or environmental exposure. Once contamination occurs, pathogens may persist through harvesting, packaging, transportation, and retail distribution (Alegbeleye et al., 2018; Iwu & Okoh, 2019).

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The complexity of these pathways explains why effective food safety relies on integrated prevention strategies rather than a single intervention point. Research consistently demonstrates that farm-to-fork approaches provide the strongest framework for reducing foodborne disease risk across modern food systems (Bintsis, 2017; Atasever, 2026).

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Food Safety Concerns

 

Food safety concerns arise whenever biological hazards contaminate food and create opportunities for disease transmission. Although foodborne pathogens are the direct cause of most foodborne illnesses, the conditions that allow contamination, survival, and spread are equally important. Modern food systems are highly interconnected, meaning that contamination occurring at one stage of production can affect large numbers of people across broad geographic regions.

Research consistently demonstrates that food safety risks are influenced by factors operating throughout the food chain, including agricultural practices, environmental conditions, food processing, transportation, storage, retail handling, food-service operations, and consumer behavior (Fung et al., 2018; Gallo et al., 2020).

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Understanding these concerns is essential for effective public-health planning and foodborne disease prevention.

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Biological Contamination Across the Food Chain

 

Biological hazards remain the most important cause of foodborne disease worldwide. Food contamination can occur before harvest, during production, throughout processing and distribution, or during food preparation and service.

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Potential contamination sources include:

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• Asymptomatically shedding food-producing animals (which carry pathogens as commensals without showing clinical signs) 

• Contaminated irrigation water

• Soil contamination

• Wildlife exposure

• Processing equipment

• Food-contact surfaces

• Food handlers

• Transportation systems

• Retail and food-service environments

 

Studies examining fresh produce contamination demonstrate that pathogens can enter crops long before harvest through environmental exposure and water contamination, highlighting the importance of preventive measures throughout agricultural production (Alegbeleye et al., 2018; Iwu & Okoh, 2019).

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Ready-to-eat foods represent another important area of concern because they often receive little or no further processing before consumption. As a result, contamination occurring during preparation or handling may directly affect consumers (De France et al., 2022).

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Food Safety Risks in Animal Production

 

Animal agriculture plays an important role in food safety because many major foodborne pathogens originate in animal reservoirs. Livestock, poultry, aquaculture systems, and wildlife can serve as asymptomatic reservoirs for pathogens that enter food chains during pre-harvest shedding or slaughter processing. 

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Foodborne bacterial pathogens such as Salmonella, Campylobacter, and certain strains of Escherichia coli are frequently associated with animal production systems and can contaminate food products through direct or indirect routes (Abebe et al., 2020; Ali & Alsayeqh, 2022).

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From a One Health perspective, food safety in animal production extends beyond protecting livestock health. Effective management helps reduce opportunities for pathogen transmission among animals, humans, food products, and environmental reservoirs (Gobena et al., 2024; Rodríguez-Melcón et al., 2024).

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Educational resources within this pillar will explore these topics in greater detail:

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Food Safety in Livestock Production

 

Food safety in livestock systems influences both animal and human health outcomes. Learn more in our guide to Food Safety in Livestock Production.

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Food Safety in Poultry Production

 

Poultry production remains closely linked to several important foodborne pathogens. Learn more in our guide to Food Safety in Poultry Production.

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Food Safety in Aquaculture

 

Aquatic food systems face unique biological hazards and monitoring challenges. Learn more in our guide to Food Safety in Aquaculture.

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Food Handlers and Human Factors

 

Human behavior remains one of the most important influences on food safety outcomes. Food handlers operate at critical points throughout the food chain, including processing facilities, restaurants, institutional kitchens, retail environments, and household settings.

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Research has repeatedly identified food-handler practices as important determinants of contamination risk, particularly when hygiene standards are not consistently maintained (Banik et al., 2020; Ochoa-Agudelo et al., 2024).

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Food-handler-associated contamination can contribute to outbreaks involving both bacterial and viral pathogens. Norovirus, for example, is commonly transmitted through infected food handlers and contaminated food-contact surfaces (Al-Daim, 2022; O’Shea et al., 2019).

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Because human behavior influences food safety at multiple levels, education, training, hygiene programs, and monitoring systems remain important components of public-health strategies.

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Antimicrobial Resistance in Food Systems

 

Antimicrobial resistance (AMR) has emerged as a growing concern within food safety and public health. Resistant foodborne pathogens can move through food chains and complicate disease management when infections occur.

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Foodborne bacterial pathogens such as Salmonella have demonstrated increasing antimicrobial resistance in some settings, creating concerns about treatment effectiveness and disease control (Kureljušić et al., 2021; Rossi et al., 2025a).

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The One Health framework has become particularly important in addressing AMR because resistant organisms may circulate among humans, animals, food systems, and environmental reservoirs. Surveillance programs increasingly incorporate resistance monitoring alongside traditional pathogen surveillance efforts (De Oliveira et al., 2024).

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Explore this topic further in Antimicrobial Resistance in Food Systems.

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Prevention

 

Research consistently demonstrates that no single intervention can eliminate foodborne disease risk. Instead, successful prevention depends on multiple coordinated controls operating throughout the food chain.

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Evidence from surveillance systems, outbreak investigations, and food-safety reviews shows that farm-to-fork prevention strategies provide the most effective framework for reducing foodborne disease burden (Bintsis, 2017; Schirone et al., 2019; Atasever, 2026).

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Farm-to-Fork Food Safety

 

The farm-to-fork model recognizes that food safety begins long before food reaches consumers. Each stage of production contributes to the overall safety profile of a food product.

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Important prevention points include:

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• Agricultural production

• Animal health management

• Water quality monitoring

• Harvesting practices

• Food processing

• Packaging systems

• Transportation controls

• Retail handling

• Food-service operations

• Consumer food handling

 

Research consistently supports integrated food-safety systems that address hazards throughout these interconnected stages rather than relying on end-product testing alone (Santos et al., 2023; Rodríguez-Melcón et al., 2024).

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Hygiene and Sanitation

 

Hygiene remains one of the most important foundations of foodborne disease prevention. Food safety literature consistently identifies sanitation and hygienic handling as critical tools for reducing contamination risks throughout food systems (Kamboj et al., 2020; Schirone et al., 2019).

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Food hygiene includes practices related to:

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• Personnel hygiene

• Environmental sanitation

• Equipment cleaning

• Surface disinfection

• Waste management

• Cross-contamination prevention

 

Although hygiene principles are widely recognized, maintaining consistent implementation across complex food systems remains an ongoing challenge in many regions (Ali et al., 2026).

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Readers may explore these topics in:

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Food Hygiene and Sanitation

Safe Food Handling Practices

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Surveillance and Outbreak Detection

 

Modern food safety increasingly relies on surveillance systems that identify outbreaks, monitor trends, and support rapid public-health responses.

Large surveillance networks have substantially improved understanding of foodborne disease patterns and transmission pathways. Systems such as FoodNet have provided valuable incidence data and helped identify changing trends among major foodborne pathogens (Tack et al., 2020; Delahoy et al., 2023).

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Surveillance also plays a critical role in source attribution, allowing investigators to identify foods, environments, and transmission routes associated with outbreaks (Beshearse et al., 2021).

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Explore Food Safety Surveillance and Monitoring.

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Advances in Detection Technologies

 

Rapid detection has become one of the most active areas of food safety research. Traditional laboratory methods remain important, but newer technologies increasingly support faster pathogen identification and improved outbreak investigations.

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Recent advances include:

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• Culture-independent diagnostic testing

• Molecular diagnostics

• Whole-genome sequencing

• Biosensor technologies

• Genomic surveillance systems

 

These approaches improve pathogen detection, source tracking, outbreak investigation, and risk assessment capabilities (Aladhadh, 2023; Kabiraz et al., 2023; Mather et al., 2024).

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While culture-independent diagnostic testing (CIDT) has accelerated rapid clinical diagnosis, whole-genome sequencing (WGS) serves as a critical bridge—restoring physical isolate capabilities to recover high-resolution strain typing, source attribution, and antimicrobial resistance profiling across public health networks. 

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Current Research Themes

 

Food safety research continues to evolve as food systems become increasingly interconnected and new hazards emerge. Several major themes currently dominate the scientific literature.

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Emerging Foodborne Pathogens

 

Researchers continue to identify new foodborne risks, transmission pathways, and pathogen variants. Emerging pathogens remain a concern because surveillance systems often lag behind changing food-production practices and environmental conditions (Hassan et al., 2023; Monte & Sellera, 2025).

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One Health Food Safety

 

Increasing attention is being given to integrated approaches that connect human health, veterinary medicine, food production, and environmental monitoring. One Health framework is becoming central to food-safety planning and policy development (Rodríguez-Melcón et al., 2024; Santos et al., 2023).

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Climate and Environmental Influences

 

Environmental change is increasingly recognized as a factor influencing pathogen ecology, transmission patterns, and foodborne disease risks. Researchers are examining how climate-related events affect food safety systems and pathogen movement across human, animal, and environmental interfaces (Balta et al., 2024).

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Antimicrobial Resistance

 

The spread of antimicrobial resistance remains a major research priority because resistant pathogens can move throughout food systems and create challenges for both public-health and veterinary sectors (De Oliveira et al., 2024; Rossi et al., 2025a).

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Closing Evidence Gaps

 

Current literature reveals significant disparities in evidence coverage. Bacterial foodborne pathogens are well studied, while viral pathogens, foodborne parasites, and emerging hazards remain comparatively underrepresented. Researchers continue to call for stronger surveillance systems, broader global reporting, and improved monitoring of understudied foodborne risks (Newell et al., 2010; Albert et al., 2024).

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Frequently Asked Questions

 

What are foodborne diseases?

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Foodborne diseases are illnesses that occur after consuming food contaminated with harmful biological agents such as bacteria, viruses, parasites, or their toxins. These diseases range from mild gastrointestinal illness to severe systemic infections and can affect individuals of all ages. Foodborne diseases remain a major global public-health concern because contamination can occur at multiple points throughout the food chain (Kirk et al., 2015; Adley & Ryan, 2016).

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Why is food safety important?

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Food safety helps reduce the risk of foodborne illness, hospitalization, long-term health consequences, and death. Effective food-safety systems also support public health, food security, consumer confidence, agricultural sustainability, and international trade (Fung et al., 2018; Tibebu et al., 2024).

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What are the most common foodborne pathogens?

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Foodborne pathogens vary by region and surveillance system, but commonly recognized pathogens include:

• Norovirus

• Salmonella

• Campylobacter

• Escherichia coli (E. coli)

• Listeria monocytogenes

• Hepatitis A virus

• Various foodborne parasites

 

Research indicates that Norovirus causes a substantial proportion of foodborne illnesses in some countries, while Salmonella remains a leading cause of severe disease and foodborne mortality (Walter et al., 2025).

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How do foodborne pathogens enter the food supply?

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Foodborne pathogens can enter foods through numerous routes, including:

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• Animal reservoirs

• Contaminated water

• Soil contamination

• Wildlife exposure

• Food-processing environments

• Transportation systems

• Food-contact surfaces

• Human handling

 

Because contamination can occur at many stages, food safety requires prevention efforts across the entire farm-to-fork continuum (Alegbeleye et al., 2018; Bintsis, 2017).

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What is the One Health approach to food safety?

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The One Health approach recognizes that human health, animal health, and environmental health are interconnected. In food safety, this means addressing risks across agricultural production, animal populations, environmental reservoirs, food systems, and public-health surveillance programs. One Health strategies support more comprehensive prevention and outbreak response efforts (Rodríguez-Melcón et al., 2024; Gobena et al., 2024).

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How are foodborne outbreaks detected?

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Modern outbreak detection relies on surveillance systems, laboratory testing, epidemiology, and increasingly advanced genomic technologies. Whole-genome sequencing and other molecular tools have improved the ability to identify outbreaks, track transmission pathways, and connect cases across geographic regions (Aladhadh, 2023; Mather et al., 2024).

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Why is antimicrobial resistance a food-safety concern?

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Antimicrobial resistance can occur in foodborne bacterial pathogens, potentially making infections more difficult to manage. Because resistant organisms can circulate among humans, animals, food systems, and environmental reservoirs, antimicrobial resistance is considered a major One Health challenge (Kureljušić et al., 2021; Rossi et al., 2025).

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Explore Related Topics

 

Continue exploring the One Health & Public Health Veterinary Knowledge System:

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One Health & Public Health Overview

Foodborne Pathogens

Food Hygiene and Sanitation

Safe Food Handling Practices

Food Safety Surveillance and Monitoring

Food Safety in Livestock Production

Food Safety in Poultry Production

Food Safety in Aquaculture

Antimicrobial Resistance in Food Systems

Emerging Foodborne Threats