Health officials were struggling to answer a broader and potentially worrisome question: how the infection occurred.

A Canadian teenager is currently in critical condition after contracting a suspected case of H5N1 bird flu, a British ...

It's not clear how the British Columbia teenager picked up the virus, which has been detected recently in wild birds and ...

A new study revealed more farmworkers had signs of infection, even though they reportedly did not display symptoms of illness.

The new guidance comes after blood tests for 115 farmworkers in Michigan and Colorado showed that eight workers had ...

The CDC said Thursday it is updating its recommendations for testing, treatment and protection for workers who may be exposed animals infected with bird flu.

In other news: a Kansas prisoner sues over health care; the FDA warns against contaminated compounded weight loss drugs; bird flu; tuberculosis; and more.

The operation, dubbed Cold Meat 2, launched last week. It tracked 18,000 head of cattle raised in 100 square miles (260 ...

A second person in Missouri who wasn't exposed to either poultry or dairy cows has been infected with bird flu.

Pigs can be infected with human and avian flu, upping chances for the virus to evolve and become more infectious ...

But finding bird flu in a pig raises worries that the virus may be hitting ... Washington, Michigan, Texas and Missouri — ...

Health officials also reported recently that a second person in Missouri who wasn't exposed to either poultry or dairy cows ...