CDC Confirms First Severe U.S. Bird Flu Case as Virus Mutates and Spreads

"The CDC says the bird flu has mutated, as a 65 year old patient... is suffering the nation's first severe infection."

"The patient is one of the 66 confirmed bird flu cases in humans, in 10 states across the US."

"Symptoms of the virus include cough, sore throat, and trouble breathing."

"Nearly all of the 66 confirmed human cases involve people who were infected after working on dairy or poultry farms."