Most strains of bird flu (or avian influenza to give it its scientific name) are relatively harmless to their natural bird hosts and do not infect humans - this sort is known as low pathogenic avian influenza (LPAI).
Večina sevov ptičje gripe (z znanstvenim imenom aviarne influence) je razmeroma neškodljivih za svoje naravne gostiteljice ptice in ne vpliva na ljudi – ta vrsta je znana kot nizko patogena aviarna influenca (LPAI).