HIV is present in blood and other body fluids. You can become infected with HIV if you allow some body fluid from an infected person to get inside your body. Although it is quite rare, there have been reported cases of people becoming infected by HIV-infected blood getting into the bloodstream through an open cut, or splashing onto a mucous membrane (e.g. The eyes or the inside of the nose).
Any thing porous would allow the HIV virus to pass through and eye for that matter is porous and there is a likelihood of the virus getting though if the infected blood is splashed on it.
HIV can not survive in the mouth due to the presence of the enzyme called lysozyme that is present in the saliva, and I am not sure about the eyes.
A person will be infected with HIV only when the virus gets access into his blood circulation. If there is no tear or abrasion in the mucous membrane of the mouth or in the conjunctiva of the eye, there is no chance of getting HIV infection on splashing of HIV infected blood into the mouth or the eyes.
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