marek's vaccine in older birds

Discussion in 'Emergencies / Diseases / Injuries and Cures' started by yoderfarms, Dec 23, 2015.

  1. yoderfarms

    yoderfarms Out Of The Brooder

    Jan 16, 2015
    Berwick, LA
    Do anyone know if you can give the Marek's vaccine older birds? I have heard of people giving older birds marek's vac. The bottle says how to vaccine in day old chicks but, I want to see what the oldest age you can give it.
  2. ChickenCanoe

    ChickenCanoe True BYC Addict

    Nov 23, 2010
    St. Louis, MO
    You can vaccinate later but it may have no effect.
    Every day past day old, the vaccine has less effectiveness.
    The reason is that it is in a race with Marek's in the environment. It takes time for antibodies to develop and if exposed to a strain of Marek's they're susceptible to, it won't work.

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