Reported cases of several types of food poisoning rose last year in the United States, but it’s likely that the actual rates have remained largely unchanged, the U.S. Centers Disease Control and Prevention said Thursday.

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Increases in reported illnesses could be due to new diagnostic tools that detect more cases, the Associated Press reported.

The data show that more needs to be done to make food safer, according to Rob Tauxe, director of the CDC’s foodborne illness division.

The two most common causes of infection — salmonella and campylobacter — have been longtime problems, he noted. Both are spread through animal feces.

The report is based on data from 10 states, but is considered indicative of trends nationwide, the AP reported.

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