I just today purchased a Polish chick, 3-weeks old, from a local breeder along with some other chicks. Immediately, I noticed that the chicks had watery droppings, and must not have been kept in very safe conditions. My Polish chick seems to be showing the only real symptoms of being sick. She's very lethargic, and barely walks at all before falling down, almost as if she can't walk at all. Her droppings are very watery, sometimes just water, and she has a huge lump on the front of her chest that I've never seen on a chick before. Her feathers are also very raggedy. Is this Coccidiosis, and if so, what should I do to try to help her? Will she infect my other chicks?