The now-recalled requeson cheese was produced by Maryland-based Clover Hill Dairy. Patients have been identified in New York, Maryland, and Virginia, with the earliest illness occurring in early 2023 and the most recent in May 2026.
Nearly all of the ill people interviewed reported consuming Raw Farm-brand raw dairy products. Testing and an onsite inspection of Raw Farm’s operation in California is ongoing. Raw Farm LLC has yet to issue a recall.
“If mandatory authority needs to be strengthened, the Food Safety Caucus stands ready to tackle this issue at FDA’s request,” wrote Congress members in a statement about the ongoing E. coli outbreak involving Raw Farm raw cheese products. Raw Farm has so far refused to recall.
This episode of Food Safety Five discusses two scientific advancements related to Listeria monocytogenes control: 1) a study that showed the effectiveness of combining antimicrobial blue light with chemical sanitizers for pathogen inactivation, and 2) the development of a new growth prediction model for L. monocytogenes in artisanal cheeses.
Researchers from the University of Córdoba
in Spain have developed a model for predicting the growth of Listeria monocytogenes in artisanal cheeses, which will be especially useful to producers that must demonstrate compliance with recently expanded EU regulations for controlling the pathogenin ready-to-eat (RTE) foods.
According to a pre-publication version of a study conducted by Cornell University and backed by FDA, aging raw milk cheese may not be effective at eliminating the Highly Pathogenic Avian Influenza H5N1 virus. However, adequate heat treating or pH 5.0 conditions could be effective.
The U.S. Food and Drug Administration (FDA) recently began a national sampling and testing assignment for Highly Pathogenic Avian Influenza H5N1 (HPAI H5N1) in raw cow’s milk cheese.
A U.S. District Court has entered a consent decree of permanent injunction against Rizo Lopez Foods, a company that produced queso fresco and cotija cheese products linked to a decade-long listeriosis outbreak, requiring the firm to stop producing and selling certain products until FDA can confirm its compliance with federal food safety regulations.
A recent study evaluated the effect of brine pH, salt level, storage temperature, and use of hydrogen peroxide to kill Listeria monocytogenes and Staphylococcus aureus, salt-tolerant pathogens known to contaminate cheese brine.
The U.S. Food and Drug Administration (FDA) will release a new prevention strategy aimed at reducing foodborne listeriosis cases and outbreaks associated with the consumption of fresh, soft Queso Fresco-type (QFT) cheeses.
