HIV mainly appears in patients' blood, blood, nocturnal emission, female secretions and their milk, and its transmission routes are asexual contact transmission, blood transmission and mother-to-child transmission. In the 1980s and 1990s, due to the backwardness of medical standards and testing machinery and equipment, there were indeed cases of HIV infection after blood transfusion. However, due to the rapid development of medical technology, the possibility of infection during blood transfusion in regular hospitals is extremely low. Blood and blood products brought to patients by hospital outpatient departments are strictly tested by blood collection agencies according to industry standards, and only when they meet the safety standards will they be dripped to patients.
After testing all normal blood, there may still be potential blood-borne infections such as hepatitis B virus, hepatitis C virus, AIDS virus, mold virus, dengue fever, rubella virus infection and EB virus infection. But we don't need to worry too much. The current diagnosis and treatment methods and blood products management methods have reduced the risk to a very low level, and the probability is very low. As long as it is handled properly, it is generally impossible to cause great harm to the human body.
The transmission routes of HIV are: sexual transmission, mother-to-child transmission and blood transmission. The route of blood transmission includes blood transfusion or various blood products. At present, people who donate blood through blood transfusion in China have to be screened for HIV antibody or viral nucleic acid, so the probability of HIV infection through blood transfusion has been greatly reduced, but it is not 100% safe. If the infected person donates blood during the AIDS window, it is possible to detect antibodies or viral nucleic acids, but the blood actually contains viruses, so it will also lead to the infected person being infected.