Other less likely means of transmission exist, though are rare. There are no confirmed cases from contact with the saliva, sweat or tears of an infected person.
Early on in the epidemic, there was much confusion about the transmission of HIV. After decades of study, this has been clarified. HIV can be found in various body fluids, however its highest concentrations are found in semen, blood, and vaginal secretions. It can also be found in breast milk.
As summarized by the Centers for Disease Prevention and Control:
== Infection ==
After exposure, the virus invades and replicates in immune cells near the site of infection. It quickly spreads to regional lymph nodes and via the blood stream to the rest of the body.
== References ==