In the United States, HIV is spread mainly by
- Having sex with someone who has HIV. In general:
- Anal sex is the highest-risk sexual behavior.
- Vaginal sex is the second highest-risk sexual behavior.
- Having multiple sex partners or having other sexually transmitted infections can increase the risk of infection through sex.
- Sharing needles, syringes, rinse water, cotton, cookers or other equipment used to prepare injection drugs with someone who has HIV.