The concerning bird flu outbreak that has spread to four humans so far as it expands quickly in the U.S. has jumped to dozens ...

Zoonotic transmission of avian influenza in the U.S. prompts worry as virus reaches cats and dogs in multiple states. A highly infectious type of avian influenza, commonly known as bird flu, has ...

Bird flu is continuing to spread in animals across the United States more than a year after ... This is believed to be the first instance of mammal to human spread of the H5N1 strain.

The H5N1 bird flu virus has spread to dairy cows in the United States, raising concerns about ... of avian influenza ever jumps across the species divide. Avian flu infected a commercial flock ...

For now, bird flu doesn't easily infect humans and doesn't spread ... mammals it infects," Adalja said, "the more chances it has to adapt to mammals." More than 166 million birds across all 50 ...

Health officials continue to monitor the spread of bird flu in Washington state ... keep the virus from jumping from birds to mammals. That's why state agencies and health researchers like ...

A new study describes how bird flu has spread between dairy cows and from cows to other mammals. Experts worry ... people continues to grow: Colorado state health officials confirmed three new ...

Between July and October states across the country ... Scientists worry that the bird flu could mutate to spread more easily among mammals, including humans, if given the opportunity.

Gavin Newsom declared a state of emergency Wednesday ... to learn about the multiple ways the (bird flu) virus is being spread through our domestic species," he said. In December, the USDA ...

N.Y. State officials worry that federal actions will harm efforts to stem the spread of bird flu. (Michael M. Santiago | Getty Images) As bird flu cases inundate more poultry and dairy farms ...