H5N1 is a human creation
That came from intensive poultry farming in China
Avian influenza viruses are endemic in wild aquatic birds, with whom they have coevolved for millions of years. They cause minimal disease; damaging their hosts would impair their own spread.
nautil.us/the-unnatura...
nautil.us
The Unnatural History of Bird Flu
H5N1 is a human creation