It is embedded. But we still see the need to try to control the virus within the animals that keep it alive --- poultry and wild fowl. It's a frontline response, and one that might not work. But we need to mount as many defenses as we can, if for no other reason than to buy time,
Migratory birds are the main distributors on the international scale and there is no way to stop them. Locally, migratory fowl and the trade in live and recently dead poultry keep it in circulation, too.