Four Different Genetic Strains Of Bird Flu Virus Discovered

Any Or All Could Mutate And Trigger Global Pandemic

From Forbes :

"...the H5N1 virus exists frequently in domesticated poultry populations and also in wild birds before they migrate. Using genetic analysis, the researchers found four distinct sub-lineages of the virus existing in birds from different geographical areas.

"Multiple, different vaccines are going to have to be prepared and held ready in case one of these goes human-to-human...It will be necessary to have vaccines to each one of them."