LONDON, Aug. 18 (UPI) -- Scientists in Britain say vaccinating poultry against the H5N1 strain of avian influenza could spread the disease faster if it is done badly.Researchers from the universities of Edinburgh and Warwick found that when flocks are incompletely protected a phenomenon known as “silent spread” occurs. Fewer birds die so the virus is not detected as it spreads from farm to farm.>>> Discuss This Story
