Should I have my chicks vaccinated? I have the option to have them vaccinated against Mareks and Cocci.
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Hmmm... You've got me rethinking vaccinations, Erica.You can't vaccinate against marek's if the birds have been outside, and you can't vaccinate older birds. When vaccinating against marek's, it's done before the birds have had any chance (at all) of exposure to the virus.
Since the virus is carried in dander (shed skin/fluff) and dust, it's almost impossible to guarantee that they haven't been exposed unless strong biosecurity protects the hatching area and the birds are newly out of the eggs.
It's a terrible disease, no doubt about that. I believe exposing birds to wild milder marek's strains (from the natural environment -- other birds etc) gives immunity, and I've never vaccinated (or had marek's appear except, possibly, in a vaccinated bird -- it's possible for the disease to show up even if a bird is vaccinated). Then again I don't take my birds to shows, and I don't keep purebreds (some of which may be more susceptible). I keep reasonable biosecurity, at least from other chickens.
Marek's is dreadful but well worth doing a thorough google on before deciding whether to vaccinate or not. Most backyard flocks here in Australian aren't vaccinated. Indeed if I'm looking for new birds, I stay away from any that are vaccinated -- it's a useful indication that the flock has been exposed to the lethal form of marek's and didn't have innate resistance or a strong enough immune system to survive.
Just my thoughts, for what they're worth,
Erica