Colorado confirms first human case of avian flu in U.S.

The first identified human case in the United States of the H5N1 virus, known as the avian flu and typically transmitted among poultry and wild birds, has been found in a Colorado man who works on a Western Slope poultry farm.

The Colorado Department of Public Health and Environment has been monitoring and testing people exposed to poultry and wild birds infected with avian flu, according to a news release.

Earlier this week, a test revealed the presence of the influenza virus in a single nasal specimen of a man who was working on a farm with infected poultry, the news release said.

On Wednesday, the Centers for Disease Control and Prevention confirmed the test. Repeat testing on the man, however, has been negative.