Okay. Will do. Another question, I'm not sure how it is transfered but I have a 4th chicken who lives indoors. Their cages are close to one another but they never are out together/touching. I'm pretty good about washing my hands between holding the little ones and holding the older one but there's always the chance someone in my house isn't. Is it safe to treat Sp00n (the older one) as well even if she might not be infected? I don't want to take any chances on her but I also don't know how chickens immune system works (if they build up a tolerance, medications on not sick birds actually harm them, ect).
The protozoa that cause Coccidiosis are always present in a chicken's digestive system, in small amounts. It can be found nearly everywhere, in wet litter, droppings, etc. If a chicken is suddenly introduced to a new strain (there are nine types of Coccidiosis, all infecting different parts of the digestive tract), it will often get Coccidiosis. A chicken can also get Coccidiosis if it is stressed out, or if the Coccidosis-causing organisms rapidly multiply.
Coccidosis can be prevented by feeding medicated feed (the feed contains Amprolium). However, medicated feed is not 100% effective against Coccidosis, and chickens can get the disease even while eating the feed. Higher amounts of Amprolium are needed to cure the disease. Keeping their area spottlessly clean, or raising chicks on wire, can reduce the possiblity of chicks getting Coccidiosis.
You can treat your other chicken, but I don't think that it is neccesary. Being older, she has likely built up a resistance to Coccidiosis.
While treating for Coccidiosis, remember to not give your birds apple cider vinegar or vitamins. The way that Corid works is that it inhibits thiamine (vitamin B1), which the Coccidia organisms need to live. Vitamins would defeat the purpose, as they would simply replace the thiamine.
