Salivary protein, which prevents transmission of human immunodeficiency virus via saliva is:: (A) Sialoperoxidase, (B) Secretory IgA, (C) Salivary leukocyte proteinase inhibitor, (D) Histidine rich proteins
Answer is C. Secretory leukocyte protease inhibitor (SLPI) is found in human saliva, nasal secretions, tears, cervical mucus and seminal fluid. It is believed to be responsible for the anti-HIV properties of external secretions.