"A new version of the virus is widespread in wild birds but had not previously been detected in cows."
"Dairy cows in Nevada have been infected with a new form of bird flu that is distinct from the version that has been spreading through herds over the last year, the U.S. Department of Agriculture announced on Wednesday.
The finding indicates that the virus, known as H5N1, has spilled from birds into cows at least twice — leading to these two sets of infections — and that it could continue to do so. It also suggests that the virus may pose a persistent risk to cows and to the people who work closely with them.
Before last year, scientists did not know that cows were susceptible to this type of influenza.
“This is not what anyone wanted to see,” said Louise Moncla, an evolutionary biologist who studies avian influenza at the University of Pennsylvania. “We need to now consider the possibility that cows are more broadly susceptible to these viruses than we initially thought.”"
Emily Anthes and Apoorva Mandavilli report for the New York Times February 5, 2025.
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