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10/10 chicks lost...this makes me ill...I am soooooo sorry.
I have misc layers that are around 2 years old...bought at Feed Store (before I had BYC to educate me).
I have 1 older cochin hen bought elsewhere (unsure if she was vaccinated but can find out)
3 Seramas (almost a year old)...
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I am sorry..I know this is an older posting/thread....but I am having some neighboring scare of Marek's. But you say you vaccinate older birds....what I am curious is...I am being told after 6 months...you are probably in the clear. Jeffers states to not use the vaccine on chicks over...