Infectious Disease OutbreaksOutbreak

H5N1 bird flu infections in US dairy cows and zoonotic spillover concern

March 30, 2026Helen Branswell

Helen Branswell notes ongoing uncertainty after H5N1 infections in US dairy cows raised fears of a new animal-to-human transmission route, with cow infections reportedly slowing but key questions unresolved.

“2 years ago now the world learned US dairy cows were being infected with #H5N1 #birdflu, raising concern the virus would find a new route to move from animals to humans.”
“Cow infections seem to have slowed & many questions remain”
Helen Branswell
H5N1zoonosisanimal-to-human transmission

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