Not sure if I’m in the right thread. So my question is dealing with coccidiosis. If you get layer chicks from the hatchery and get the vaccine, can you put chicks you hatched yourself with them. Will they benefit from the vaccine? Is there a time period where you shouldn’t mix them. Going forward can those adult birds affect new chicks that you hatched. I have been getting vaccinated layers for over 10 years. I’ve hatched out a few of my own, but have really started getting into hatching the last two years. I’ve sold many chicks and have never had a problem with any of them or the ones I’ve kept on my farm. Everyone is healthy. Recently I had a lady buy some chicks (they were born 3 months after my spring layers arrived). They had been by themselves in my brooder box (I clean it out after every hatch, it’s dry) and while they were in the same barn area, they weren’t mixed directly with any adult chickens. She mixed them with another batch of chicks and came down with coccidiosis. The vet said they can get it from vaccinated chickens. And the other lady said you should never mix them. What’s everyone’s take on this. The one hatchery I spoke with said if you mix them, the chicks will benefit from the vaccine. Research says after 12 weeks the vaccine is no longer valid. If you buy mediated feed, you’re basically doing the same thing as the vaccine. So what’s the difference? Long post I know, but so many different stories. The whole thing is now a bit confusing and I want to do the right thing. Thoughts anyone?
my rooster, however, is still doing fine so 
I just hatched some of his chicks and I am hoping they get some sort of natural immunity or something since he seems fine but we’ll see.
