Lymphatic System

Specific Defenses

How is the HIV virus transmitted from one person to another?

HIV is transmitted via unprotected sexual contact with an infected partner or through contact with infected blood. Rigorous screening of the blood supply and heat-treating techniques for donated blood have reduced the rate of transmission via blood transfusions to a very small percentage. However, sharing needles and/or syringes with someone who is infected is still a mode of transmission of the HIV virus. In the past, HIV was frequently passed from a mother to her baby during pregnancy and/or birth. Treatments are now available that reduce the chances of a mother passing the virus to her child to one percent.


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