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Public health surveillance identified A(H5) in raw milk sales, prompting regulatory actions in California.
In November-December 2024, the County of Santa Clara Public Health Department detected influenza A and A(H5) virus in unpasteurized milk sold in the county. A(H5N1) virus surveillance of off-the-shelf unpasteurized milk led to early detection and recall of potentially infectious products that prompted state agencies' verification and subsequent regulatory action.
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Løchen et al. (2025) studied this question.
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