A branch of the H5N1 bird flu family tree that hadn't previously been seen in cattle has now been detected in dairy cows.

Dairy cows in Nevada have been infected with a new strain of bird flu virus different from the one circulating in other herds throughout the past year, the U.S. Department of Agriculture (USDA) said.

Herds of cattle in Nevada tested positive for the strain of H5N1 bird flu never before seen in cows, state agriculture ...

The CDC's Morbidity and Mortality Weekly Report ( MMWR) resumed publishing after an unprecedented 2-week hiatus, but without the three H5N1 avian influenza papers that were slated to publish on Jan.