Intravenous drug use: intravenous drug addicts sharing syringe or syringe to strict disinfection is the risk of HIV infection behavior, single exposure to infectious probability is 0.67%.
Receiving blood or blood products: mainly refers to the acceptance of pollution with HIV blood or blood products, single exposure to infectious probability ranged from 90to 100%.
It mainly refers to the medical apparatus is not clean, resulting in medical service of HIV infection, including medical personnel in the provision of medical services, exposure to infected / patient body fluids, which led to the infection of HIV. Accidentally contaminated HIV apparatus such as a needle stick injuries of skin or mucosa, direct contact with HIV fluids, single exposure to infectious probability is 0.3% ~ 0.5%.
Spread through sexual contact
Spread through sexual contact is currently the major route of HIV transmission, about global ( roughly )70% ~ 80% infected through sexual contact with the HIV, including heterosexual sexual contact accounted for more than 70%, and gay male sexual contact accounted for5% ~ 10%. Occurrence of an unprotected sexual intercourse, male homosexual of infectious HIV probability is about 0.5 ~3%. In heterosexual contact, male to female probability is 0.1~ 0.2%, female to male the probability is 0.03~ 0.1%.
HIV infected mothers during pregnancy, childbirth, can process or postnatal lactation situations such as HIV transmission to the infant, perinatal transmission probability is about 30%.