The virus known as H5N1 is now endemic among poultry and wild bird populations in east Asia.A flu strain with a talent for transforming itself to foil the human immune system,it kills two out of every three people it infects.The world healh organizationn warns that avian flu is on the verge of mutating into a super contagius form that could travel at pandemic velocity killing up to 100 million people within two years.