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current bird fluScience News
•87% Informative
Researchers tracing the family tree of the H5N1 avian influenza virus say the outbreak in cattle probably started in December 2023 .
Virus has spread to dairy cows in at least nine U.S. states.
Virus is a huge family tree, with some branches of its own, including genotype B3.13.13 .
Genotype B3.13 is a mix of four gene segments from the H5N1 that arrived from Europe in 2021 and four from a low pathogenicity bird flu from North America .
It shows up relatively rarely among the viruses sampled in birds, but it undergoes reassortment far more often than earlier relatives.
The virus made the leap from birds to cows just one time, researchers say.
The B3.13 genotype virus has also spilled from cows to raccoons, poultry and wild birds, researchers say.
There were as many as five spillbacks from cattle to poultry and three from cows.
The Texas dairy farm worker who got an H5N1 eye infection was carrying a slightly different but closely related version of the virus.
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