Kissing does not normally transmit AIDS.
AIDS is a highly dangerous infectious disease, caused by HIV infection, the main means of transmission is blood transmission, sexual transmission and mother-to-child transmission, the risk of transmission of AIDS by kissing is very low, but only if there is no bleeding in the oral mucosa of both kissing parties.
Different body fluids have different levels of HIV, blood has the highest level of virus, saliva has a very low level of virus, the amount of virus per unit volume is not enough to cause new individual infections, in addition, saliva contains an enzyme that inhibits the replication of the virus, the intact skin and mucous membranes of a healthy person have a strong barrier effect, which is able to isolate the invasion of a variety of bacteria and viruses, including the HIV virus, so simple kissing is relatively safe.
Therefore, under normal circumstances, kissing is not contagious.