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Correct.It is. But I don’t believe the issue is Marek’s. These chicks would have been vaccinated on day one or two and the vaccine takes a bit of time to ‘take’ (unscientific description for the chick to build immunity).
Some people say that takes three or even four weeks, although the only scientific study was pretty clear that it was 10 days.
Anyway, that was the quarantine I had to do with my Hooligans. Bob’s rascals are older so it is about other diseases but it shouldn’t be about Marek’s as they built their immunity long before they set out on their journey to FBA.