Food poisoning from salmonella, listeria still a problem in US: CDC - USA TODAY

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  • The CDC study found 8% fewer cases of foodborne illnesses in 2021 compared to 2016-2018.
  • Food safety experts attribute the slight drop to disruptions caused by the COVID-19 pandemic.
  • Study authors say regulatory and industry leaders must focus on prevention to reduce food poisoning.

Cases of food poisoning slightly decreased in 2021 compared to pre-pandemic years, according to a new study from the Centers for Disease Control and Prevention.

But it's not a cause for celebration, said food safety experts, who mostly attribute the decrease to COVID-19 pandemic disruptions.

"There's not enough evidence to give a ringing endorsement to the (food) industry," said Thomas Gremillion, director of food policy at Consumer Federation of America, a nonprofit advancing consumer interests.

Overall, the Foodborne Diseases Active Surveillance Network found 8% fewer cases of foodborne illnesses in 2021 compared to the average between 2016 and 2018, according to the study published Thursday in the agency's Morbidity and Mortality Weekly Report. Researchers identified over 22,000 infections, including over 5,300 hospitalizations and 153 deaths in 2021.

The overall drop was mostly due to a decline in salmonella infections, said lead author Dr. Jennifer Collins, a medical epidemiologist at the CDC.   

"Salmonella is one of the most common infections that we found in 2021, which is typical for food," she said. "Because it's so common, the drop accounted for most of the overall decrease."

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Salmonella infections are attributed to poultry and produce, occurring at a rate of 14.2 cases per 100,000 population in 2021. The report showed campylobacter, which is commonly attributed to chicken products, was identified in 17.8 cases per 100,000.

While incidences of salmonella decreased, those from other pathogens increased or stayed the same in 2021 when compared to 2016-2018. Cases of campylobacter, listeria and shigella remained steady while cases of cyclospora, vibrio and yersinia increased.

"We know how to reduce the burden of foodborne illnesses and we know the policies that we need to be taking to do that and we haven't, yet," Gremillion said. "If we had the policies that we needed ... we'd see a very steep decrease across the board."

Study authors say the COVID-19 pandemic may have played a part in the slight drop of foodborne illnesses by suppressing travel and dining out. According to the report, about 7% of infections were related with international travel compared to 13% in 2016-2018.  

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The coronavirus may have also disrupted surveillance efforts as people who wanted to avoid health care facilities during the pandemic did not seek medical attention or used telemedicine services for their foodborne illnesses, Collins said.

"Our FoodNet data reflects lab diagnoses," she said. "We can't catch infections if stool samples aren't sent."

Food poisoning typically causes mild symptoms including cramping, nausea, vomiting or diarrhea, said Dr. Christine Lee, a gastroenterologist at the Cleveland Clinic. The majority of patients recover within one or two weeks with supportive therapy.

But some who are immunocompromised may develop life-threatening conditions. She said it's important to seek medical attention if symptoms worsen including dizziness, bloody diarrhea, and the inability to tolerate food and fluids.

Although consumers can reduce their risk by washing produce and cooking meats thoroughly, food safety experts say industry leaders and regulatory officials can make the biggest difference to prevent food poisoning.

"Prevention efforts need to be improved to address the root cause of foodborne illness, which includes contamination on farms and processing facilities, to have food be as safe as possible for consumers," Collins said.

Follow Adrianna Rodriguez on Twitter: @AdriannaUSAT. 

Health and patient safety coverage at USA TODAY is made possible in part by a grant from the Masimo Foundation for Ethics, Innovation and Competition in Healthcare. The Masimo Foundation does not provide editorial input.

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