20 May 2015 --- The avian bird flu, highly pathogenic avian influenza (HPAI) H5 spread in the US has now been reported in 20 states, while the states of Minnesota, Wisconsin and Iowa have declared states of emergency as a result of the crisis. Some 37m birds are estimated to have been slaughtered already, some because they carry the virus, but some due to the high risk of carrying the virus.