Generally, if you are scratched by a domestic cat, you do not need an injection. If you are scratched by a stray or wild cat, it is best to go to the hospital for an injection, because domestic cats generally do not carry rabies virus, so after being scratched, you only need to Wash the wound repeatedly with soapy water, and then apply iodine for disinfection; if there is bleeding, squeeze out the blood and disinfect it again.