Key Takeaways

  • 48 million Americans get sick from foodborne illness yearly (CDC data)
  • Foodborne outbreaks can permanently close food establishments
  • High-risk populations include elderly (65+), children under 5, pregnant women, and immunocompromised individuals
  • Prevention costs far less than responding to an outbreak
  • Two or more people sick from the same food = outbreak
Last updated: January 2026

1.1 Understanding Foodborne Illnesses

Every year in the United States, an estimated 48 million people get sick from foodborne illnesses. Of these, approximately 128,000 are hospitalized, and 3,000 die. These numbers represent real people—customers, friends, family members—whose lives are impacted by unsafe food handling practices.

What Is a Foodborne Illness?

Foodborne illness (also called food poisoning or foodborne disease) is an illness that results from eating food contaminated with harmful substances. These contaminants can be biological (bacteria, viruses, parasites), chemical (cleaning agents, pesticides), or physical (glass, metal fragments).

Foodborne-illness outbreak occurs when two or more people become sick after eating the same food, and health authorities confirm the food as the source of the illness.

The True Cost of Foodborne Illness

When a foodborne illness outbreak occurs, the costs extend far beyond medical bills:

Type of CostImpact
Medical & LegalHospitalization costs, medical treatment, lawsuits, legal fees
Loss of BusinessCustomers stay away; negative reviews spread quickly
Staff ImpactLost work hours, retraining costs, low morale
Reputation DamagePermanent harm to brand and reputation
Regulatory ActionHealth department closures, fines, increased inspections
InsuranceHigher premiums or policy cancellation

Reality check: Many restaurants that experience serious outbreaks never reopen. The financial and reputational damage is simply too great to overcome.

High-Risk Populations

While anyone can get a foodborne illness, certain groups are particularly vulnerable and face more severe consequences:

The Big Four High-Risk Groups:

  1. Elderly Adults (65+)

    • Weakened immune systems make it harder to fight off pathogens
    • Approximately 50% of elderly people who contract foodborne illness require hospitalization
    • Organs are slower to recognize and eliminate harmful bacteria
  2. Young Children (Under 5)

    • Immune systems are still developing
    • Nearly 30% of foodborne illness deaths worldwide involve children under 5 (WHO)
    • Less body mass means smaller doses of pathogens cause severe illness
  3. Pregnant Women

    • Immune system changes during pregnancy increase vulnerability
    • 10 times more likely to get Listeriosis than general population
    • Pathogens can cross the placenta and harm the unborn baby
  4. Immunocompromised Individuals

    • People with HIV/AIDS, cancer, diabetes, or autoimmune diseases
    • Transplant patients on immunosuppressive drugs
    • Disease and treatments weaken the body's ability to fight infection

For the Exam: Remember the Big Four high-risk populations. Questions often ask you to identify which groups require extra protection or are most vulnerable to foodborne illness.

Annual Foodborne Illness in the US (CDC Data)
Test Your Knowledge

According to CDC data, approximately how many Americans get sick from foodborne illnesses each year?

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Test Your Knowledge

What defines a foodborne-illness outbreak?

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Test Your Knowledge

Which group is considered high-risk for severe foodborne illness?

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Test Your Knowledge

What percentage of elderly people (65+) who contract foodborne illness typically require hospitalization?

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