Johanna Acosta, of the Bronx, a Planned Parenthood

Johanna Acosta, of the Bronx, a Planned Parenthood health educator, explains how the instant HIV exams work. These tests take a swab of the cells in the cheek and gums to test for HIV. If the test comes back positive for reactants, it is still possible, however, that the patient does not have HIV, as other things can cause it to come back positive. Further testing is necessary. (Aug. 25, 2012) (Credit: Caylena Cahill)

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