New Goat to the herd

[Sanhestar]

I would keep him seperated for a while but don't think that HE will have problems. At his age and having been a 4H goat his body will have encountered many more pathogens (and developed antibodies against) then your youngsters. Antibodies are for live, they don't vanish.

Adding vaccinations to the stress of moving and switching herds could in fact deplete his immune system to the point where he becomes sick (vaccines deplete the vitamin c stores).