Getting a haircut with a razor blade may transmit HIV, but the chance of infection is low.
The risk of contracting AIDS from a cut on the scalp during a haircut is small, but only if the blade has already come into contact with the blood of a person with AIDS, and then cuts the scalp immediately afterwards, and if there is an active HIV virus on the blade.
However, this kind of coincidence is relatively rare, because the HIV virus is not easy to survive after leaving the body, and only the blade with active HIV has the risk of infection. So this behavior does not belong to high-risk behavior, if the patient is worried about the risk of infection, you can go to the regular hospital for HIV antibody test to clarify.
HIV transmission mainly depends on blood, mother-to-child and sexual contact, if there is a history of the above high-risk contacts need to consult a doctor in time for examination.