The Food and Drug Administration said regulators had examined 201 commercial dairy samples, including milk, cottage cheese and sour cream, and had so far not found evidence that potentially infectious virus was on grocery shelves.
The U.S.D.A. announced last month that dairy cattle in Texas and Kansas had tested positive for the bird flu virus, called H5N1. It has since reported cases in dozens of herds in eight states.
New research questions the long-held theory that reintroduction of such a predator caused a trophic cascade, spawning renewal of vegetation and spurring biodiversity.
Some say that the wolves’ contribution to ecological improvements in Yellowstone were only one piece of a larger picture and that grizzly bears, beavers and even humans played a role.
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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