Cats are usually infected with feline distemper through direct or indirect contact with the feces, urine, vomit, saliva and other secretions of other sick cats.
Some cats may carry the feline distemper virus themselves, but their own immunity is relatively strong, so they do not get sick for the time being. When a cat changes to a new environment, gets cold, or is frightened, it will lead to a decrease in immunity, and then symptoms of feline plague such as fever, vomiting, diarrhea, lethargy, and loss of appetite will occur. Send the cat to a pet hospital for treatment in a timely manner.