Hi, My neighbor whats some of the chicks that I order buts she told me her dad bought her a show bird and it killed her flock here's what she told me I vaccinate for newcastle/bronchitis and the other is Laringopharygitis (sp). Mine are all vacc. which makes them carriers. I can't add to the flock without vaccinating them first. I do it myself. Its just a drop in the eye. My dad bought me some show birds years back and didn't realize that show birds are all vaccinated for these. (its mandatory) I lost three quarters of my birds in less than a month before I figured out what it was that was killing them. Gasping for breath etc. nasty horrible way to go. So now I have to vaccinate all new birds. So be careful. Don't buy birds that may have been shown or came from someone who shows. Baby chicks are ok, because they can't be vaccinated until they are 4 weeks. I haven't had any trouble with Mareks, and I always use medicated starter feed to get them going. After that the only meds they get are wormer every 4 months. Thanks I need help on this for I don't show birds but my wants to .