Features of H5N1 influenza viruses in dairy cows may facilitate infection, transmission in mammals

A series of experiments with highly pathogenic H5N1 avian influenza (HPAI H5N1) viruses circulating in infected U.S. dairy cattle found that viruses derived from lactating dairy cattle induced severe disease in mice and ferrets when administered via intranasal inoculation. The virus from the H5N1-infected cows bound to both avian (bird) and human-type cellular receptors, but, importantly, did not transmit efficiently among ferrets exposed via respiratory droplets.

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