The new case, in a Michigan farmworker, did not suggest that bird flu was widespread in people, health officials said, adding that the risk to the general public remained low.
H5N1, an avian flu virus, has killed tens of thousands of marine mammals, and infiltrated American livestock for the first time. Scientists are working quickly to assess how it is evolving and how much of a risk it poses to humans.
So far, bird flu in cattle seems to affect only lactating cows, and only temporarily. There have been no diagnoses in calves, pregnant heifers or beef cows, and no deaths.
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