Hello dear, The chances of acquiring HIV through saliva is very rare due to minimal viral load. Moreover, the virus cannot stay alive for longer time outside the body or in dry fluids. To relieve your concern regarding HIV infection, you can undergo certain tests like p24 assay or PCR for HIV, which becomes positive within a week and are almost 100 % sensitive. Even the presence of a single virus in the body can be detected by PCR. So, if this test comes negative, you can be sure that you are safe. Wishing you a good health. Take care.