Too late for Mareks vaccine

PaisleyPlaceHens

Hatching
Jun 10, 2020
1
0
1
Hello all! New chick mom here. I have 3 chicks who came from one hatchery and are vaccinated for Mareks and a 4th who came from a farm with no vaccination. The non vaccinated baby is about 3.5 weeks old. There are no other chickens nearby and they will go into a brand new coop. Since she's past the critical age for vaccination and her flockmates are vaccinated, should I bother trying to vaccinate her?
 

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