Bird flu has spread to another district in Bangladesh despite efforts by authorities to contain it, taking the number of affected districts to 40, Reuters quoted officials as saying on Sunday. Health workers culled nearly 12,000 fowls after tests confirmed some chickens had died from the avian influenza virus in the northeast, livestock officials said. So far, no human infections have been reported in Bangladesh, a densely populated nation with millions of backyard poultry and thousands of chicken farms.
