HANOI, Nov. 26 (Xinhua) -- Chickens have died en mass with unidentified causes in Vietnam's southern Long An province since early October, while bird flu is hitting three provinces in the country's northern and central regions, local newspaper Pioneer reported Monday.
Specimens from 800 dead chickens of a household in the province's Tan An town are being tested, the paper quoted head of the provincial Veterinary Bureau, Dinh Van The, as saying.
Earlier, the southern Tien Giang province reported that over 50,000 chickens raised in more than 10 farms in its Cho Gao district died after suddenly stopping eating.
Now, bird flu is hitting the two northern provinces of Ha Nam and Cao Bang, and central Quang Tri province, according to the Department of Animal Health under the Vietnamese Ministry of Agriculture and Rural Development.
Bird flu outbreaks in Vietnam, starting in December 2003, have killed and led to the forced culling of dozens of millions of fowls in the country.