Bleeding from a rat bite without an injection may lead to more serious consequences. There are many kinds of bacteria and viruses in the mouth of rats, and there is the possibility of tetanus infection. Although the possibility of rabies onset is small, after being bitten and bleeding by a rat, the injured person is at risk of developing renal syndrome hemorrhagic fever, and if the infection is not vaccinated, symptoms such as fever, headache, orbital pain, back pain, skin flushing, etc. will occur, followed by bleeding, impaired kidney function, and even shock, and only by injecting the hemorrhagic fever vaccine as soon as may prevent more serious problems from occurring. After being bitten by a rat, the wound must be cleaned promptly and thoroughly to prevent infection from occurring. If the bite bleeds, hemorrhagic fever and tetanus vaccinations should be administered, and whether rabies vaccine is administered depends on the circumstances.