Generally, injections are not needed if the hand is scratched by a cat, because not all cats can carry rabies virus, and the rabies virus is transmitted through saliva and blood, so the scratch will not cause infection. However, the wound needs to be cleaned in time, washed with soapy water for about 15 minutes, and then applied with iodophor for disinfection. If there is bleeding, the blood should be squeezed out.