The first case of bird flu has appeared in the United States just as hard-hit Thailand said it hoped to clear the last outbreak of an epidemic that has killed 18 people and decimated poultry flocks across Asia.
More than 12,000 chickens have been quarantined in the U.S. state of Delaware and are due to be destroyed after they were found to have a strain of the virus which differs from the one that has killed people in Thailand and Vietnam, the Delaware State News reported on its Web site.
Delaware Secretary of Agriculture Michael Scuse told the newspaper the strain found in the U.S. chickens was known as H7. The killer Asian strain was H5N1.
"We are trying to act as quickly as possible," Scuse told the Delaware State News. "We are trying to protect an industry here that is awfully valuable".
In addition to the destruction of the 12,000 chickens in Delaware's Kent County, all farms within two miles of the infected birds will be tested within the next week, Scuse said.
South Korea, which is battling its own outbreak of the virus, reacted swiftly to reports of the discovery in Delaware, immediately halting imports of U.S. poultry.
News of the U.S. outbreak came on the same day the Prime Minister of Thailand - one of the 10 Asian countries hardest hit by the epidemic - said he expected the last outbreak of the virus to be contained within days.
"There is only one red zone, in Bangkok at Lat Krabang. We hope to clear that within one or two days," Thaksin Shinawatra said in his weekly radio address to the nation.
Thailand, the world's fourth biggest chicken exporter has slaughtered 26 million fowl and was confident the virus was under control, Thaksin said.
Last week, Thailand had more than 140 of the "red zones", the five-km (three-mile) area around a confirmed outbreak within which the government orders the slaughter of all poultry.
Officials say they will go back over all the former red zones to make certain the virus, which has killed at least five Thais as well as at least 13 Vietnamese, has been eradicated.