The vets had no symptoms, and one worked only in states where no dairy infections had been reported.

A new version of the virus is widespread in wild birds but had not previously been detected in cows.

The cases have spurred new pet food safety rules and poultry surveillance efforts.

Levels of PFAS in sewage sludge used as fertilizer can pose risks that sometimes exceed safety thresholds “by several orders of magnitude,” the agency said.

Despite the serious risks of drinking it, a growing movement — including the potential health secretary Robert F. Kennedy Jr. — claims it has benefits. Should we take them more seriously?

The deceased was over 65 and had other medical conditions, state officials said.

The administration is committing an additional $306 million toward battling the virus, and will distribute the money before President-elect Donald J. Trump takes office.