No, the symptoms of cat plague are not harmful to humans, but they are harmful to similar species. Feline distemper is a viral disease with a high mortality rate if left untreated. Cats in the early stages of feline plague will show symptoms such as vomiting, diarrhea, loss of appetite, fever, etc. At this time, owners should take the cat for examination and treatment immediately. In addition, regular vaccination of cats can reduce the occurrence of feline plague.