China is reeling from its third reported bird flu outbreak in one week.
The latest instance, reported on Wednesday in the central province of Hunan, has killed 545 chickens and ducks.
The news follows Tuesday's finding of bird flu in a flock of more than two thousand chickens and geese in China's eastern Anhui province.
Also Tuesday, Indonesian health officials said a fourth person in Bogor, West Java has died from the virus.
Officials around the world are tightening agricultural controls and pledging cooperation in the fight against bird flu.
Health officials from some 30 nations are also meeting in Ottawa, Canada to discuss the threat. At the conference, the United States and Canada pledged to support global efforts to prevent the virus from becoming a human pandemic.