The U.S. reported the first outbreak of the deadly H7N9 bird flu on a poultry farm since 2017, as the country continues to grapple with another strain.

Mississippi state and federal officials have confirmed an outbreak of a strain of bird flu not reported in the U.S. since 2017, with quarantine and depopulation efforts already underway.

Parks officials in California have canceled popular guided elephant seal tours for the remainder of the season and temporarily closed public viewing areas following a recent outbreak of bird flu at a ...