Profit, plague and poultry: the intra-active worlds of highly pathogenic avian flu

Birdwatchers and others are being asked to look out for any signs that wild birds may be dying from the highly pathogenic form of avian influenza known as H5N1, one of sixteen or so strains of flu virus endemic to wild birds and transferable to domestic poultry and also, in the right circumstances, to pigs and other animals.