Q.List any three modes by which HIV can spread from an infected person to a healthy person.

HIV spreads through a limited number of well-defined routes, not through casual contact. Three important modes of transmission are: (1) unprotected sexual contact with an infected person; (2) transfusion of contaminated blood or blood products that have not been properly screened; and (3) sharing needles or syringes, particularly among people who inject drugs, since even a tiny amount of contaminated blood on a shared needle can transmit the virus. A fourth important route, not asked for here but worth knowing, is transmission from an infected mother to he …

List exactly three distinct routes as the question asks, and phrase each as a specific, named mode of …

Do not include casual contact, sharing food/utensils, or mosquito bites in the list — these are common misconcepti …