New toxic strain of H5N1 bird flu spreading fast in Vietnam

New toxic strain of H5N1 bird flu spreading fast in Vietnam: "September 9, 2012 – VIETNAM – A new highly-toxic strain of the potentially deadly bird flu virus has appeared in Vietnam and is spreading fast, according to state media reports. The strain appeared to be a mutation of the H5N1 virus which swept through the country’s poultry flocks last year, forcing mass culls of birds in affected areas, according to agriculture officials."