First and foremost the possibility and chances of the blood in question, to be that of a HIV positive person, would be very less, unless you are a health care worker, and work with HIV positive patients.
Any way, for your information, fears over the casual transmission of HIV have also led many people to be concerned over the risk of contact with spilled blood, dried blood or other body fluids, even in microscopic quantities.
It is important to bear in mind that whilst HIV may live for some time outside the body, HIV transmission has not been reported as a consequence of contact with spillages of blood, semen or other body fluids, although many healthcare workers do come into contact with HIV-infected body fluids. Viral survival is influenced by virus titre, volume of blood, ambient temperature, exposure to sunlight and humidity.
1. Direct contact of infected blood or fluid, to a intact skin, does not result in infection, as HIV cannot permeate through the thick keratin layer of the skin.
2. Contact with dried up blood smears, with intact skin , does not result in spread of infection.
3. In case, you are a health care worker, and the blood was actually infected, and was very fresh (less than 2- 5 minutes), and you had a open bleeding cut, then chances of infection would be higher.
In such a case, you should go ahead and get screened for HIV.
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