I have a flock of 8 chickens that were vaccinated. I have an opportunity to get a couple more but they will not be vaccinated. They will be babies coming from a hatchery like my others, but I'm getting them from the local feed store Southern States and they are not paying the extra dollars to do it. Will I be taking a chance? Obviously my babies will be seperated for at least 8 weeks from my older birds, but I didn't know if it was something that would develop later on? I live in VA., and I don't know how common the disease is here. Any advice?