Hi
I've just been checking back over your other posts and see you had a hen with laying problems in February.
We definitely need lots more information about their symptoms, their age(s) and breed(s), what you feed them and your general set up. Were they adults when you got them and when was that? Adult chickens don't usually suffer from Coccidiosis unless they are moved to a new location where there is a different strain of cocci. It has also been unusually dry here in the UK (I'm guessing you are in the UK since you mention Coxoid in another thread..... including your location on your profile page is really helpful, so that we can see at a glance where in the world you are each time you post). Coccidiosis is usually more associated with warm, wet conditions unless your chickens' immune systems are compromised.
Worms can be checked via a faecal float test or worm egg count .... the vet should be able to do it but there are also labs that will do them....I'm pretty sure Westgate Labs does them for chickens as well as horses (if you are in the UK) and probably cheaper than the vets.... you buy a sampling kit, take the sample and send it off to them and you get the result within a couple of days.... I usually get next day results for my horses samples from them.
Diet is also very important for laying hens, so knowing what you feed them is very relevant.
Once we have more information we may have a better idea of what the problem is.
Best wishes
Barbara