Falling is not an option. Birds getting injuries while young can get marek's later. I forget where I saw it but rough handling,mishaps, temp and stress can reverse a marek's vaccine. If you don't vaccinate don't matter because they pick up the immunity from the flock and it can get reversed. They are very fragile even with green limbs. Also, at 3 weeks 80 F is the lowest they should have to encounter. Don't worry they will be grown up before you know it and Mom can start teaching them survival skills later. Lot's of time for that. So keep them warm so they can live to learn it.
The thing about reversing the vaccination isn't true. They don't even use real Marek's when they vaccinate so the vaccine can't give them Marek's, and rough handling wouldn't cause a bird to lose antibodies that it made in response to the vaccine. Not sure where that was posted but wherever it was was wrong
For anyone curious, since they use a turkey disease to vaccinate for Marek's, a bird that is vaccinated actually CAN get Marek's, they just don't show symptoms. They'd have to pick it up from wild birds or other chickens, though, they can't get it from the vaccine.
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