A newer variant of H5N1 bird flu has spilled over into dairy cows separately in Nevada and Arizona, prompting new theories about how the virus is spread and leading to questions about containing the ongoing outbreaks.
The news comes amid a purge of experts at federal agencies, including employees who were responding to the highly pathogenic avian influenza outbreak at the US Centers for Disease Control and Prevention (CDC) and the US Department of Agriculture.
The additional spillovers are changing experts’ view of how rare introductions to herds may be – with implications for how to prevent such spread.
“It’s endemic in cows now. There is no way this is going to get contained” on its own, said Seema Lakdawala, an influenza virologist and co-director of the Center for Transmission of Airborne Pathogens at Emory School of Medicine.
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