H5N1 bird flu detected in U.S. San Francisco

SAN FRANCISCO, June 3 (Xinhua) -- Two chickens at a live bird market in San Francisco, U.S. state of California, tested positive for H5N1 bird flu last month, authorities announced on Monday.

The San Francisco Department of Public Health reported that state health officials discovered the infected, asymptomatic birds during a routine monitoring program conducted by the California Department of Food and Agriculture.