At least 70 people have been infected nationwide, including 41 exposed to the virus by dairy cows. Bird flu is a virus that spreads among wild birds but can also infect poultry and livestock.

For several years, the virus has been jumping from wild birds into wild mammals, and last March it was identified in cows for the first time. Scientists are sounding the alarm: Bird flu’s jump ...

It appears that there may have been another spillover of H5N1 bird flu virus from wild birds into dairy cattle. The Arizona Department of Agriculture announced Friday that it had found the virus ...