Thai livestock officials prepare to kill chickens by using toxic gas during the culling of poultry at a farm in Nakhon Phanom province, northeastern Thailand, Tuesday, Aug. 1, 2006. Thailand's health minister told officials to work '24 hours a day' to fight bird flu, as they scrambled to cope with an unexpected resurgence of the deadly virus. In the past two weeks, two new outbreaks have occurred among poultry and a teenage boy became the country's first human fatality this year. As many as 300,000 chicken in this province have been culled since Sunday, July 30, 2006. (AP Photo/Apichart Weerawong)

Chicken wait to be catch and cull at the corner of a bamboo farm house in Nakhon Phanom province. (AP Photo/Apichart Weerawong)

Thai livestock officials spray disinfectant on a vehicle passing through Nakhon Phanom province. (AP Photo/Apichart Weerawong)