very unlikely that they got coccidiosis from the shavings. Much more likely that they got it from you.Yes, I mean pine shavings. I've had many cases of Coccidiosis in my 3 weeks olds that's never been outside. Had one really severe case last year where I had to treat them twice.
I brood mine indoors, on towels, in clean brooders, yet sometimes mine will get it.