Usually, a person who scratches his or her fingernails will not be infected with HIV, unless he or she touches the blood of a person with HIV while being scratched. HIV is mainly found in the blood, semen, vaginal secretions, pleural and abdominal fluid, cerebrospinal fluid and breast milk of infected people. After being scratched and bleeding by the nails of an AIDS patient, the AIDS patient’s nails do not carry the virus, and it is only possible to be infected with AIDS if you come into contact with AIDS blood at the broken place. The main ways of spreading AIDS are ① Sexual contact, including sexual contact between homosexuals and heterosexuals. ②Transmission through blood: including blood transfusion, importation of blood products, acceptance of organ transplantation, interventional manipulation, tattooing, etc.; sharing needles for injecting drugs or HIV-contaminated needles to stab the skin. (iii) Mother-to-child transmission. If there is a history of high-risk exposure, it is recommended to actively seek medical advice and follow the doctor’s instructions.