Microbiological Control

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Consumers often throw away meat that is still safe to eat based on the “sell by” date. Auburn University researchers are investigating methods to predict meat spoilage based on microbial activity, which would enable more accurate “sell by” dates.

This episode of Food Safety Five discusses several foodborne pathogens that have been recently highlighted by researchers due to their unusual nature, emergence, and increasing public health significance, including a rare Salmonella strain, an STEC/ETEC hybrid, Group B Streptococcus, and drug-resistant Shigella.

The action plan would outline strategies to mitigate Campylobacter and reduce cases of foodborne illness. Those who are interested in contributing to the development of the action plan are invited to register to receive communications about stakeholder engagement.

The E. coli outbreak involving Raw Farm unpasteurized dairy products has ended with one raw cheese sample matching isolates from a different 2025 outbreak. In an April 29 hearing, Congresspeople questioned whether U.S. Health Secretary Kennedy influenced FDA’s failure to mandate a recall.

In 2025, a genetically unique hybrid STEC/STEC strain was the cause of a foodborne illness outbreak that affected exclusively adults, with 90 percent of patients developing hemolytic uremic syndrome (HUS) and three deaths occurring.

Associated with freshwater fish consumption and handling, GBS ST283 causes invasive infections, including meningitis, septic arthritis, and bacteremia. WGS has played a central role in recognizing the pathogen as a foodborne hazard. FAO has identified GBS ST283 as a hazard requiring structured risk profiling.

The outbreak strain of Salmonella Bochum is extremely rare. Children and adolescents aged 2–15 years represent 75 percent of outbreak patients. Patient interviews and a case-control study point to a certain brand of chocolate-hazelnut spread as the vehicle of illness.

During its investigation of an ongoing Escherichia coli O157:H7 outbreak involving Raw Farm-brand unpasteurized cheddar cheese, FDA detected E. coli in a product sample not matching the current outbreak strain, but instead matching a strain from a different 2025 outbreak.

Per CDC and USDA-FSIS data, in 2023, Salmonella Infantis strain REPJFX01 accounted for 97 percent of S. Infantis isolates and 21 percent of all Salmonella recovered from chicken carcasses. This rising trend is closely aligned with an increase in human salmonellosis infections linked to REPJFX01.

The proportion of extensively drug-resistant isolates rose from 0 percent during 2011–2015 to 8.5 percent in 2023.