The outbreak in the Gongga county on Friday left a total of 1,000 birds dead and a further 13,080 were slaughtered. "No human infection has been reported," the agency said. Local authorities have imposed quarantine restrictions in the affected areas.
The recent outbreak comes less than a month after another case in Turpan, in northwest China, killed 4,850 birds and another 29,383 were culled.
Although no cases of human-to-human transmission of H5N1 have been reported, scientists fear the virus could mutate into a strain that could pass easily between people, causing a global pandemic.