marek's vaccine in older birds

yoderfarms

Chirping
5 Years
Jan 16, 2015
17
10
74
Millersburg, IN
My Coop
My Coop
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.
 

ChickenCanoe

Enabler
Premium Feather Member
10 Years
Nov 23, 2010
33,028
27,586
1,077
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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