Key points Overview HIV (human immunodeficiency virus) is a virus that attacks the body’s immune system. Without treatment, it can lead to AIDS (acquired immunodeficiency syndrome). There is currently no…

Key points Overview Most people who get HIV get it through anal or vaginal sex, or sharing needles, syringes, or other drug injection equipment (for example, cookers). However, there are…

At a glance In 2023, over 39,000 people were diagnosed with HIV in the U.S. and 6 territories and freely associated states. Over 80% were men, with 66% attributed to…

HIV and Immunizations Last Reviewed: May 28, 2025 Key Points What are vaccines? Vaccines protect people from diseases, such as the primary varicella infection (chickenpox), influenza (flu), and polio. Vaccines are given by needle…

What is PrEP? PrEP, or pre-exposure prophylaxis, is medicine people at risk for HIV take to prevent getting HIV from sex or injection drug use. PrEP can stop HIV from…