Bird flu reaches Hawaii, the last state that had escaped it

Authorities in Hawaii are warning residents who attended a local pet fair to watch for symptoms of avian influenza after a local flock of ducks and other birds tested positive for the H5N1 virus that has fueled a global outbreak of infections.

Officials suspect wild migrating birds are likely to blame for the first known infection of a flock in Hawaii, which had been the last state in the country with no reported cases in poultry or wild birds during the current outbreak. 

Sequencing done by the U.S. Department of Agriculture's national lab in Iowa confirmed the infection, federal officials announced Monday.