WHO investigate possible human-to-human transmission of H5N1 in Thailand, amid calls for major investment to combat avian influenza

Two new human cases of avian influenza A(H5N1) infection in Thailand have been confirmed by the World Health Organization. The two cases were in a 26 year old woman who has died, and her 32 year old sister who has been admitted to hospital. They are part of a family cluster being investigated to determine whether human-to-human transmission has occurred.