Whether a cat bite requires an injection depends on the condition of the wound. If the bite is serious and there is bleeding from the wound, you need to try to go to the CDC or hospital outpatient clinic for rabies vaccination within 24 hours. There are three possible scenarios after a cat bite. One is a gentle nibble from a cat and no skin breakage, at which point rabies vaccination is not required. The second is a cat bite, but the naked eye can not see any bleeding, the skin surface only has bite marks or bruises, at this time may be infected with rabies, rabies vaccination is required. The third is a cat bite that appears as an open wound with bleeding, at which point the rabies vaccine must be administered. In addition, if the cat bite wound is deep or large, in addition to the rabies vaccine, rabies immune serum or globulin and tetanus vaccine should be injected according to the situation. If the wound bleeds after being bitten by a cat, squeeze out the blood and then rinse the wound with running water for more than 30 minutes, and do not bandage the wound after rinsing to facilitate healing.