What I intend to have is 10-12 chicks ordered from Ideal and they will have a run attached to their coop, but will also be able to wander in the larger fenced area around their coop/run when I can be out with them. I also plan to have ducks (ordered at the same time) who will be sharing the same general area as the chickens, but the ducks will also be able to go to the closer of our two ponds when they get older. They'll occasionally be sharing the pond with an egret that hangs around the pond quite a bit and on occasion some wood ducks (although they usually stay down at our bigger pond (maybe 30 acres away) unless something is there that disturbs them, then they fly to the smaller pond or just fly off). I intend for my chickens to be a 'closed flock' in that I won't buy more, but when I need more will hatch out from my original flock, either by hen or incubator. My concern then is that my vaccinated hens would be carriers and could possibly give mareks to any chicks that hatch out. Also, I could have the ducks vaccinated (or not) but they will be in contact with wild birds and could carry disease back to the hens. The closest commercial chicken house is approx. 1/4 mile away on a neighboring farm. So do I vaccinate or not? This is driving me crazy...admittedly a short drive.