Science Jun 25 A mutation may explain why last year’s flu vaccine failed for so many Researchers at the Wistar Institute in Pennsylvania discover a mutation to explain why last year’s flu vaccine failed for so many. By Catherine Woods
Health Jan 13 Lab Finds Mutation in Bird Flu Virus; EU Pledges $100 Million in Aid A British laboratory has found that two victims of Turkey's bird flu outbreak died from a slightly mutated strain of the H5N1 virus, raising fears the virus could start spreading more easily. By PBS News Hour