Oh, Daffy, please be careful!
We took in a goose from some people in the city who had no business with a goose. She died within 2 weeks (this September), but not before giving my flock hepatitis, which can be goose-duck transferred. The strain we got was 100% fatal in all of our fall ducklings that were natural hatch and free ranging. We lost more than 35 babies - 3 different breeds. There is no cure and they only show symptoms within about 2 hours of death. We had a few scovy ducks hatch out babies after that, which we got off the grass as soon as we found them and housed in a clean new coop. But out of the 20 that we saved from the yard, about half of them (who are now 2 months old) only have grown to about 1/3 the size of the others and we are down to 12, with two of the tiny ones left. We don't expect the last two tiny ones to make it. We lost one last night, one the night before that.
We are so grateful for the week-long sub-zero temps that should have killed the virus, which can otherwise live in the ground for very long periods of time. On the upside, the adults and scovy babies that did make it should be immune now, which should pass along immunity to their offspring, but we have chosen not to re-home any birds in nearly 4 months, and we have developed a strict quarantine regimen for the few birds we have taken in since then. Please learn from our costly mistake and be careful where your birds are exposed.
That is all.