Health workers collect poultry for culling at a farm in Chandrapur, about 30 km (19 miles) from Agartala, capital of India's northeastern state of Tripura, April 27, 2008. More than 25,000 chickens and ducks have already been slaughtered in Tripura this month after it was hit by the H5N1 strain. REUTERS/Stringer (INDIA)
REUTERS/STRINGER/INDIA