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According to what I've read you can vaccinate older birds. The younger they are the better the chance that you've gotten them before exposure to the virus, which is why it's best to vaccinate at 1 day of age. The vaccine doesn't prevent them from getting the virus but does prevent the formation of the tumors that cause all the issues.
When you get your vaccine make sure you have a helper so you can work fast. I don't know how many birds you have but the vaccine, once mixed up is only good for a certain length of time. I had my kids catching the birds, I held and DH gave them their shots.
According to what I've read you can vaccinate older birds. The younger they are the better the chance that you've gotten them before exposure to the virus, which is why it's best to vaccinate at 1 day of age. The vaccine doesn't prevent them from getting the virus but does prevent the formation of the tumors that cause all the issues.
When you get your vaccine make sure you have a helper so you can work fast. I don't know how many birds you have but the vaccine, once mixed up is only good for a certain length of time. I had my kids catching the birds, I held and DH gave them their shots.