okay so i have a broody hen sitting on 12 eggs the chicks are all from exhibition quality parents. they are due to hatch in a week. the hen is at our 2nd house and the whole flock there has coryza/crd and the ones that dont have been exposed to it. the lady i bought the hen from said she vaccinated her when she was young. this hen is the only one that has never gotten it. so i need some info on the vaccinations i need to get so these new chicks wont get it either. please dont tell me to cull the whole flock because i cant they are my dads chickens and he is going to keep them. i do understand that they will be carriers for life. so i need to vaccinate the new babies. all i need is help on how to do it when to do it, where to get the vaccinations etc. thanks!