The recent detection of H5N1 bird flu in U.S. cattle, coupled with reports of a dairy worker contracting the virus, demands a departure from the usual reassurances offered by federal health officials. While they emphasize there’s no cause for alarm and assert diligent monitoring, it’s imperative we break from this familiar script.
H5N1, a strain of the flu virus known to infect bird species globally and several mammalian species in the U.S. since 2022, has now appeared to have breached a new barrier of inter-mammalian transmission, as exemplified by the expanding outbreak in dairy cows in several jurisdictions linked to an initial outbreak in Texas. Over time, continued transmission among cattle is likely to yield mutations that will further increase the efficiency of mammal-to-mammal transmission.
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Author: Luciana Borio and Phil Krause
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