Migratory waterfowl (most notably wild ducks) are the natural reservoir of avian influenza viruses, and these birds are also the most resistant to infection.
Migratory waterfowl (most notably wild ducks) are the natural reservoir of avian influenza viruses, and these birds are also the most resistant to infection.
迁移性水禽（主要是野鸭）是禽流感病毒的自然宿主，这些鸟类对感染抵抗力最强。