A highly pathogenic bird flu variant, D1.1, previously linked to deaths in humans and widespread bird die-offs, has been found in dairy herds in Nevada. This discovery raises concerns about potential spread within the dairy industry and the possibility of increased spillover events from wild birds to cattle.
A version of the H5N1 bird flu virus that killed a person in Louisiana and severely sickened a teenager in Canada has now been detected in dairy herds in Nevada. The version, known as D1.1, is circulating in wild birds around the nation — causing massive die-offs in places such as Chicago, upstate New York and Ohio. It's different from the one known to be circulating in dairy cows and that has caused only relatively mild illness in humans .
It is likely that H5 viruses 'will continue to be generated in wild birds and will continue to spill over to dairy cows,' he said. And some of these newer versions may have traits that allow them to spread more easily between cows — maybe via aerosols — or make the cows sicker. Not everyone agrees on the virus' current mode of transport between cows, but most researchers point to milk.
BIRD FLU H5N1 VIRUS DAIRY CATTLE PUBLIC HEALTH
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