Millions of chickens raised in back-yard farms have not been vaccinated of anti-avian influenza in Indonesia, posing threats to spread the virus to humans, said an official in JakartaThursday.

"About 10 percent of chickens in sector four (raised in back- yard farm) have already got vaccination," said Chairman of national commission of bird flu control and pandemic preparation Bayu Khrisnamuthi. Over 32 million families across the nation raise chickens in back-yard farm.

The official said that a meeting of bird flu experts that ended here on Thursday recommended vaccination integrated with implementation of bio-security as the priority to cope with the disease at this time.

"For the next time, vaccination along with bio-security will be the best way to stop (the spread of the virus)," he said.

Krisnamurthi said that bio-security must be imposed in all sectors, including chickens production, transport and sales.

"Eighty percent of the sales of chickens through traditional market, where the implementation of bio-security is low," he said.

Indonesia has been hardest hit by the avian influenza virus with 80 fatalities out of 100 cases. Many of the death tolls had history contact with chickens raised traditionally.

Source: Xinhua