Hundreds of chickens have died of bird flu in Aceh province, Indonesia says.
Aceh farmers have been urged to supervise their birds closely
Bird flu has been found in more than 20 other provinces in the country, but its emergence in Aceh is especially worrying, analysts say.
This is because thousands of Acehnese still live in crowded refugee camps as a result of last year's tsunami.
The news follows China's confirmation on Wednesday of its second human death from bird flu - a 35-year-old woman from eastern Anhui province.
Indonesia's Agriculture Ministry said that chickens had been infected with the deadly H5N1 strain in at least three districts of Aceh.
Seven people have so far confirmed to have died from the disease in Indonesia.
In China, the latest human fatality from bird flu was a farmer, who died 11 days after she developed pneumonia-like symptoms following contact with sick and dead poultry, state news agency Xinhua reported.
Tests confirmed she had the deadly H5N1 form of the disease, China's Centre for Disease Control and Prevention said.
China's first human fatality also came from Anhui. A boy in central China also caught the disease but recovered.
The H5N1 virus has killed more than 60 people in South East Asia since the latest outbreak began in 2003.
Outbreaks of the H5N1 strain among birds were first spotted in Vietnam and Thailand in 2003.
It spread to several other countries in the region and beyond, with reports of the disease among poultry in Russia and Kazakhstan in July - and outbreaks in Turkey and Romania.
The disease generally still does not transmit easily to humans, but fears of a pandemic have been reinforced by its spread.