A dairy worker in Nevada has reportedly been infected by the killer variant of H5N1 bird flu; analysis shows changes in new strain that makes it more lethal in mammals.

Dairy cattle in Nevada have been infected with a new type of bird flu that's different from the version that has spread in herds since last year. U.S.

A version of the avian influenza virus different from the one rampaging through herds since last spring has been detected in dairy cows in Nevada, USDA says.

U.S. dairy cattle tested positive for a strain of bird flu that previously had not been seen in cows, the U.S. Department of Agriculture said on Wednesday, ramping up concerns about the persistent spread of the virus.

A new variant of the H5N1 bird flu — the same one that led to the death of a Louisiana man — has for first the first time been found in infected U.S. dairy cattle.

The new H5N1 version, known as D1.1, was found in dairy cattle in Nevada and is different than the B3.13 type that has spread to more than 950 herds in 16 states over the past year, starting in Texas. The D1.1 infection was discovered by testing raw milk under a USDA dairy surveillance project launched last year.

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)

A new type of bird flu has been detected in dairy cattle in Nevada, according to the USDA. The strain is different from the version that has spread in U.S. herds since last year.

Nevada dairy cattle infected with a new bird flu strain, Type A H5N1 D1.1, raising concerns of multiple transmission channels.

A new strain of bird flu has infected dairy cows in Nevada, marking the second time the virus has jumped from birds to cattle.