Hong Kong authorities announced Friday that a dead chicken found in the southern Chinese territory had tested positive for the deadly H5N1 strain of the bird flu virus.

The government said laboratory tests confirmed that the chicken found floating in the sea off Hong Kong on March 2 carried the deadly strain.

The statement said there were no poultry farms within three kilometers (two miles) of where the dead bird was found, but warned farmers to be on their guard against the disease.