I wonder. Were these ducks exposed previously , and did the survivors build up a kind of flock immunity?dabbling duck species are the chief spreaders of Avian Influenza - they carry it without being killed by it or even showing any symptoms of it.
I know that in the wild the species survive. Like with the Sterns who got AI in breeding season. Most Sterns died but there were survivors, and in a few years the population grew back.

