Question on chicken vaccines. Which ones are recommended for chicks and what age should they be given? Or is the consensus to give medicated feed? I understand the concern is Coccidiosis and longer term Mareks Disease. What about some respiratory diseases? Currently have two grown chickens (just over 2 years)that seem to have conjunctivitis and a respiratory infection It does not seem bad and since respiratory Infections typically are viral and I understand conjunctivitis can also be viral I have been treating them with Vetrx and colloidal silver along with apple cider vinegar in their water. I am ordering some Oxine for cleaning everything as well as their drinking water My ultimate concern though is a broody hen sitting on a large clutch of eggs. Should I be doing something now to protect the chicks and if any hatch what vaccines, if any, should they be given. Thank you all so much for your help. Chicken veterinary care is non existent where I live.