Food poisoning is extremely common. Globally, roughly 600 million people get sick from contaminated food every year, which means about 1 in 10 people worldwide will experience a foodborne illness in any given year. In the United States alone, the CDC estimates that seven major pathogens caused 9.9 million domestically acquired foodborne illnesses in 2019. And those numbers only cover known pathogens. The true total, including unidentified causes, is almost certainly higher.
The Numbers in the U.S.
The vast majority of food poisoning cases in the U.S. come from a handful of germs. Norovirus dominates the list, causing roughly 5.5 million foodborne illnesses per year and accounting for 58% of all food poisoning acquired in the country. Campylobacter, commonly linked to undercooked poultry, is next at about 1.9 million cases. Salmonella follows with 1.3 million, then Clostridium perfringens (a toxin-producing bacteria often found in improperly stored cooked meats) at 889,000, and a type of E. coli known as STEC at 357,000.
Most of these cases never get reported. The people who get food poisoning typically ride it out at home with a few miserable days of nausea, cramps, and diarrhea. They never see a doctor, never get tested, and never show up in any database. That’s why the CDC relies on statistical models that multiply confirmed lab reports by estimated underreporting factors to arrive at the true burden. The gap between confirmed and estimated cases is enormous for every pathogen on the list.
The Global Picture
The World Health Organization puts the worldwide toll at 600 million illnesses and 420,000 deaths each year from unsafe food. Children bear a disproportionate share: 125,000 children under 5 die annually from foodborne illness, representing 30% of all foodborne deaths despite making up a much smaller share of the population. The WHO estimates that 33 million years of healthy life are lost globally each year because of contaminated food, a figure that captures not just deaths but the lasting disability some infections cause.
Who Gets Hit Hardest
Food poisoning doesn’t affect everyone equally. Young children and older adults face significantly worse outcomes when they do get sick. Children under 5 are three times more likely to be hospitalized if they contract a Salmonella infection compared to the general population. Among children under 5 diagnosed with E. coli O157, 1 in 7 develops kidney failure, a life-threatening complication.
Adults 65 and older are similarly vulnerable. Nearly half of people in that age group who get a lab-confirmed case of Salmonella, Campylobacter, Listeria, or E. coli end up hospitalized. Their immune systems respond more slowly, and they’re more likely to have underlying conditions that complicate recovery.
Pregnant women face a specific threat from Listeria, a less common but far more dangerous pathogen. Nearly everyone who develops a Listeria infection requires hospitalization, and the overall death rate is about 20%. For pregnant women specifically, nearly 25% of cases result in fetal loss or death of the newborn.
Common vs. Dangerous Are Two Different Things
The pathogens that cause the most cases aren’t necessarily the ones that cause the most harm. Norovirus is by far the most common source of food poisoning, but it rarely kills otherwise healthy people. It causes intense vomiting and diarrhea for one to three days, then resolves on its own. Salmonella and Campylobacter cause fewer total cases but lead to more hospitalizations and, occasionally, long-term complications like reactive arthritis.
Listeria sits at the opposite end of the spectrum. It causes a relatively small number of infections each year, but its hospitalization and fatality rates are staggering compared to other foodborne pathogens. That 20% fatality rate makes it one of the deadliest foodborne bacteria, even though you’re far less likely to encounter it than norovirus or Salmonella.
Cases Are Not Declining
Despite improvements in food safety regulations, foodborne illness rates have not meaningfully dropped in recent years. In the UK, where Campylobacter is closely tracked, laboratory-confirmed reports jumped 17.1% between 2023 and 2024, reaching 70,352 cases, the highest number recorded in the past decade. The reporting rate hit 121.9 per 100,000 people, exceeding pre-pandemic levels. While surveillance data from one country doesn’t perfectly translate to another, the trend reflects a broader reality: foodborne pathogens remain stubbornly persistent in modern food systems.
The Economic Cost
Food poisoning carries a substantial financial burden beyond the personal misery. The USDA estimates the total economic cost of 15 leading foodborne pathogens at $17.6 billion per year in the U.S. (in 2018 dollars). That figure includes $2.5 billion in medical costs, $731 million in lost productivity from missed work, and $14.4 billion attributed to premature deaths. The total rose about 13% from a 2013 estimate of $15.5 billion, driven by increases in healthcare costs and the economic value assigned to lost life.
Those numbers only capture the 15 pathogens included in the model. The real economic toll, factoring in unidentified causes, unreported cases, and the long-term health consequences some survivors face, is certainly larger.