Cases of H5N1 bird flu in U.S. dairy and poultry workers have largely been mild. However, a new case in a British Columbia teenager has experts worried.

A Canadian teenager is hospitalized in critical condition with suspected bird flu, health officials reported Tuesday.

A Canadian teenager infected with bird flu — that country’s first case involving a locally acquired infection — is in critical condition and experiencing difficulty breathing, health officials said Tuesday.

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 t

A teenager is in critical condition in a British Columbia children’s hospital with what is likely Canada’s first human case of H5 bird flu

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.

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,

Health officials on Wednesday confirmed bird flu in a British Columbia teen and said the virus was related to a poultry outbreak in the province. Initial testing had indicated the teenager’s infection was from bird flu and was confirmed in further testing,