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The viral particles are present in all bodily fluids, so theoretically one can contract HIV even by kissing someone (and ingesting the other's saliva). Remember though that chances of contracting HIV through normal vaginal sexual contact are in the range of .1% per coitus. The viral load in saliva is probably a lot lower, which is why the chance of contracting it that way is negligibly small. There is no documented case of HIV contraction in that way.
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