Our expert says:
although HIV can be detected in saliva, it is not regarded as infectious and there are no documented cases of HIV transmission through saliva as far as I know. There is a protein in the mouth that attaches itself to the surface of blood cells and blocks infection by HIV. This proteien apparently reduces the concentration of HIV in saliva to non-infectious levels. However if the person has blood in the saliva ( i.e. injury to the mouth) the risk may be higher.
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