The city es...Czech Authorities Kill 70,000 Birds at H5N1 FarmsAround 70,000 birds have been killed at two Czech poultry farms where the H5N1 strain of bird flu, which is potentially fatal to humans, was confirmed this week, veterinary authorities said Friday . ......Czech authorities have also decided to kill a further 70,000 birds, mostly chickens and turkeys, on three nearby farms even though b