The cat scratched and bled a little bit and needs to be vaccinated. The cat scratched a little blood, proving the existence of a wound, if the cat carries rabies virus as well as bacteria, then the virus and bacteria carried by the cat may invade the body with the wound, with the risk of inducing tetanus and rabies, rabies currently has no effective drug treatment, poor prognosis, mortality rate of almost 100%, so it is recommended that timely tetanus vaccination and rabies vaccination. A cat scratch with a little blood is a tertiary exposure. It is recommended that the blood at the wound be squeezed out as much as possible first, then the wound can be rinsed repeatedly with a large amount of flowing soapy water or repeatedly with a large amount of cool boiling water, and finally disinfected with alcohol or iodine. After simple treatment, the patient should be seen in the emergency room the same day and the vaccination should be completed. In principle, patients should receive tetanus vaccine and rabies vaccine within 24 hours of injury to stimulate the body to produce antibodies to achieve better protection. Tetanus vaccine, or tetanus toxoid, is indicated for people who have open trauma and are at risk of tetanus infection. In addition to this product, tetanus antitoxin or tetanus human immunoglobulin may be administered at another site, as appropriate, for severely contaminated wounds or for those who have not been immunized throughout before the injury. No skin test is required before rabies vaccination, but five injections are required, on the day after injury and on the 3rd, 7th, 14th and 28th days after injury. A half-hour clinical observation is required after all vaccinations to avoid adverse reactions. On the day of vaccination, redness, swelling and pain may occur at the injection site, which can usually be relieved by itself. Do not eat spicy and irritating food after vaccination and pay attention to a light diet.