It will not hurt them even if they are incubating it, but if they are already incubating an infection the vaccine will not prevent it.
I get mine from First State Veterinary Supply. It's cheap - but there is the shipping. They ship the vaccine and diluent, which you mix togehter. The include a metal prong (looks like a double sewing needle with a plastic handle) that you dip in the vaccine and stick through the wing web. It's not hard, but with grown birds you should have a helper to hold the birds.
Don't worry - they will be all right. If any develop wet pox, feel free to PM me and I will tell you what I did to help mine through it.
I get mine from First State Veterinary Supply. It's cheap - but there is the shipping. They ship the vaccine and diluent, which you mix togehter. The include a metal prong (looks like a double sewing needle with a plastic handle) that you dip in the vaccine and stick through the wing web. It's not hard, but with grown birds you should have a helper to hold the birds.
Don't worry - they will be all right. If any develop wet pox, feel free to PM me and I will tell you what I did to help mine through it.