The World Health Organization calls for increased monitoring of H5N1 avian flu after its genetic material is detected in pasteurized milk in the US.

The FDA confirms the presence of H5N1 genetic material in milk but assesses the commercial milk supply as safe, citing the absence of live virus.

H5N1 has affected cows on at least 30 farms in eight states, with additional reports in cats and a human case, signaling a wider animal host range.

The U.S. Department of Agriculture implements new controls, including mandatory testing for dairy cattle and mandatory reporting of cases by labs and veterinarians.

Farmers have shown resistance to the testing efforts aimed at containing the spread of the bird flu.

International collaboration is emphasized to tackle the H5N1 threat, with forthcoming studies expected to shed more light on the outbreak.

Health experts reassure consumers that pasteurized milk remains safe to drink and there's negligible risk of H5N1 infection from dairy products.