Well, I think they originally get it from mosquito bites, and then they can give it to eachother. But with all the mosquitos, it's likely they've all gotten it from them. You know what's funny? Once they get it, they are immune. So I sort of treated it like when my kids got chicken pox. I didn't try and separate them. I just let them all get it, that way I don't have to worry about it next year.
My friend also told me that, once you've noticed the fowl pox, they've probably had it for a week or so anyway. So I though there was no point in trying to separate my flock. Also, I really don't have the facilities to do that. I only have one large hen house.
Also, Julie, I didn't try and put anything on the pox marks. I just figured they should dry out on their own, and they did. I've heard the terms dry pox and wet pox, so I guess my flock had the dry.