The different strain, D1.1, was recently found in cattle for the first time. Bird flu is continuing to spread across the U.S., and experts say they are "concerned" as public health officials ...

CNN reported Saturday night that a worker tested positive for the D1.1 version of the H5N1 bird flu virus. Confirmation testing by the Centers for Disease Control and Prevention is underway.

A new strain of bird flu, D1.1 variant was detected in a dairy worker in Nevada after he was exposed to infected cattle, making it the state's first human case of the H5N1 avian influenza.

A new strain of bird flu, the D1.1 variant, has been detected in a dairy worker in Nevada, marking the first human case of H5N1 avian influenza in the state. While the infection generally leads to ...