FDA found 20% of retail milk samples tested positive for bird flu genetic fragments, suggesting wider spread in cows. Additional tests underway to confirm virus destruction by pasteurization.
Experts are not concerned about the safety of commercial milk, but alarmed by the potential unrecognized spread of bird flu in dairy herds. Only 33 herds confirmed infected in the US.
Past studies show pasteurization of eggs effectively destroys H5N1, raising hope for milk safety. Positive milk samples suggest more infections in herds than detected.
FDA notes higher positive results in milk from areas with infected herds, indicating possible missed infections. 20% positive samples do not imply widespread cow infection due to pooled milk.
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