Coccidia is a protozoan parasite that can infect the intestinal tract of cats, and the appearance of the cat's feces can be an indicator of infection. However, it is important to note that the appearance of the feces alone is not a reliable way to diagnose coccidia. A definitive diagnosis can only be made through a fecal test performed by a veterinarian. In some cases, the feces of a cat with coccidia may appear loose, watery, or diarrhea-like and may contain mucus or blood. The feces may also have a foul odor. However, it is important to note that these symptoms can also be indicative of other intestinal issues or infections. If you suspect that your cat may have coccidia or any other intestinal issue, it is important to seek veterinary care. A veterinarian can perform a thorough examination and diagnostic tests to determine the cause of the symptoms and develop an appropriate treatment plan.