Possible egg eater in my flock

[Crazy Maizie]

I treated them for coccidiosis before, but never had the infection confirmed. I had one really sick hen who did recover after plenty of nursing, but I'm still not sure what caused her illness. Possibly worms, but she remained sick for a while after i dewormed her. She seems healthy now, though, and actually took a dominant position in the flock since. I keep wondering if they're repeatedly getting infected by worms, but I don't see worms in their poop, and if that's the case, what can I do besides the obvious to stop them from getting continually infested? I spread lime and keep things as dry as possible (I use pine shavings and bedding pellets), and their coop is kept clean.

You used an antibiotic - that's what I was referring to. Depending on environment (wet environments), some deworm every 6 months.

I do wonder about age. You've had a lot of issues from the beginning (according to your threads) for a flock that you got at a year old. I have had issues once in awhile with older hens - very rarely with younger hens - except when I had ISA browns. They only lay well for 2 years and then their bodies give out.