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, goats, foxes, and house cats.

Meanwhile, a case of bird flu has been detected for the first time in a pig in the United States as officials scramble to contain the spread of the virus there. "The U.S. Department of Agriculture [USDA] and Oregon state veterinary officials are ...

A teenager is in critical condition in a British Columbia children’s hospital, sick with Canada’s first presumptive human case of avian influenza. “This was a healthy teenager prior to this, so no underlying conditions,” said provincial health officer Bonnie Henry in a news conference on Tuesday.

A Canadian teenager is hospitalized in critical condition with bird flu, health officials reported Tuesday. The teen has been receiving care at BC Children’s Hospital in Vancouver since Friday, the same day an initial test came back positive for H5 influenza.

A Canadian teen is hospitalized in critical condition with what is believed to be bird flu, a British Columbia health official said Tuesday. It’s not clear how the teenager picked up the virus, which has been detected recently in wild birds and poultry in the province,

A Canadian teen is severely ill with what is believed to be bird flu. The teen is not known to have had any contact with infected animals.