Contact with saliva, tears, sweat, feces or urine
Transmission can only occur when a sufficient amount of HIV enters the bloodstream, through cuts or mucous membranes. These "bodily fluids" either contain no HIV or it exists in a quantity too small to result in transmission.
HIV is
not transmitted by saliva. There is a great deal of evidence to support this fact. In a study of 79 men with AIDS, the virus could be found in the saliva of only one. This man had PCP, thrush, and other mouth and throat lesions. Even in this man, the level of virus found in his saliva was 10,000 times less than the level in his blood. To this study we can add the evidence of the countless numbers of people who have had saliva contact with people with AIDS or others who have been infected with HIV. This contact has occurred through kissing, sharing food, and many other means. They can find no evidence that these activities have transmitted the virus even a single time. Recent findings suggest that saliva contains an enzyme which kills HIV. Certainly there is a lot at work in the mouth combining to make it an inhospitable site for the virus: acids, enzymes, friction, dilution, air, and more.
more available at
SF AIDS Fdn: How HIV Is Spread Saliva, Tears, and Sweat
HIV has been found in saliva and tears in very low quantities from some AIDS patients. It is important to understand that finding a small amount of HIV in a body fluid does not necessarily mean that HIV can be
transmitted by that body fluid. HIV has
not been recovered from the sweat of HIV-infected persons. Contact with saliva, tears, or sweat has never been shown to result in transmission of HIV.
more available at
HIV and Its Transmission | Factsheets | CDC HIV/AIDS 
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