Concern grows as bird flu spreads further in US cows: 32 herds in 8 states

Enlarge / Greylag geese sit on a field and rest while a cow passes by in the background. Getty | Daniel Bockwoldt

Researchers around the world are growing more uneasy with the spread of highly pathogenic avian influenza (H5N1) in US dairy cows as the virus continues to make its way into new herds and states. Several experts say the US is not sharing enough information from the federal investigation into the unexpected and growing outbreak, including genetic information from isolated viruses.

To date, the US Department of Agriculture has tallied 32 affected herds in eight states: Idaho, Kansas, Michigan, New

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