About 6 months ago I had a case of fowlpox go through my chickens. Wet pox killed 2 birds. I vaccinated the remaining 30 birds and didn't lose anymore. This spring I hatched 5 super healthy Magpie/Ancona mix. Blue and black. They are going on 4 weeks old and I am wondering if it would be smart to vaccinate these 5 ducklings and if so how do you administer the vaccine. I know chickens have to be at least 6 weeks old with a wing stick. I don't know about ducks.