H5N1 avian influenza, more commonly known as bird flu, has infected more than 100 million birds in the U.S. and almost 500 dairy cattle herds across 15 states. The virus has popped up in mammals including elephant seals,

There have been dozens of confirmed human cases of bird flu in the U.S. this year. Experts discuss the symptoms, risks and how to prevent getting sick.

Canada detected its first human case of the new strain. Sen. Elizabeth Warren (D-Mass.) said Monday that President elect-Trump “and his transition team are already breaking” a law on presidential transition.

In what is believed to be Canada's first human case of bird flu, a teenager is in a British Columbia children's hospital in critical condition with a presumptive case of the virus, the CBC reports. Authorities say the unnamed teen developed symptoms Nov.