vaccinated

I made the biggest mistake when I started quarantining 2 new chicks, 8 weeks old. I got them from a very reputable person who's raising chickens. The chicks are vaccinated from Merricks and coccidiosis. The hatchery recommends that raising the chicks in their own poop strengthens the vaccine so...

Does anyone have experience with a mixed flock of birds vaccinated for Mareks with birds unvaccinated? What happened to the birds weekly/monthly/over the years living together? Thanks!

Okay so a few weeks ago I lost a young pullet to unusual symptoms. The bird acted lethargic, puffed itself up, closed its eyes, retracted it’s head inward, and eventually it couldn’t walk. It also would occasionally make strange noises unlike anything I’ve ever heard from a bird (sounded like a...