I had four chickens. They were just over a year old. It all started just over a week a go. One chicken died and one became ill over night. Before I could get her to the vet she died too. The two remaining chickens were checked thoroughly and one showed signs of illness the other didnt. They were taken to the vets who diagnosed Coccidiosis. I was given a medication to put in their water. (1ml in 1 litre of clean water everyday) Despite this I still lost the chicken. I have one remaining chicken. I scrubbed and washed everything with Jeyes fluid. When it was dry I sprinkled DE in the run (which is sand and gravel) and in the bed area. The surviving chicken so far is showing no signs of illness. I am still giving her the medicated water a day. I want to get more chickens but I am nervous they will become infected too. Could anyone offer advice on if it is ok to get more chickens and how long I should leave it before getting them? Would my surviving chicken be ok with three young chickens? Also is putting apple cider vinegar in their water and DE in their food enough to keep them healthy or is there other stuff I need to do. They are fed on a ground complete chicken food. I hope am not being too vague. I am not that experienced with chickens and I feel I did something terribly wrong and it was my fault they died. I just dont want to get more if I am doing something wrong. Thank you for taking the time to read this and I heartly appreciate any suggestions anybody could offer me in this matter. Kindest regards.