It’s been nearly eight months since avian flu was first detected in U.S. dairy herds, and cases in both cows and humans continue to pile up.

That slow burn of infections through our nation’s livestock, a new vessel for the virus, has never been good for public health. It creates more chances for the H5N1 virus to change in ways that put humans at risk. But the ongoing spread among dairy cattle — and to a limited number of farm workers — gets more anxiety-inducing as we head into the winter flu season.

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