How HIV Is Transmitted
HIV spreads only through specific routes. Understanding them clearly is the first step toward prevention.
7Main transmission routes
<2%Pregnancy transmission risk (without intervention)
The Seven Routes
- Unprotected sex. HIV passes through semen, vaginal fluid, and rectal fluid during vaginal, anal, or oral sex with an infected partner.
- Unscreened blood transfusion. Donated blood must be tested for HIV before use. Unscreened blood from an infected donor carries a direct transmission risk.
- Shared needles and sharps. Needles, razors, or any sharp instrument contaminated with infected blood can transmit the virus. HIV can survive for a time in used needles and syringes, so sterilization or single use is essential.
- Unregulated tattooing and piercing. Equipment that is not properly sterilized between clients poses a real risk — particularly in informal or home settings.
- Childbirth. A baby can come into contact with the mother's blood during delivery. Medical teams take specific precautions to reduce this risk.
- Breastfeeding. HIV is present in breast milk. Infected mothers are advised not to breastfeed in order to protect the infant.
- Organ transplant. An organ from an HIV-positive donor can transmit the virus to a recipient. Rigorous donor screening is critical.
Key precautions: use condoms consistently; insist on screened blood and organs; never share needles or sharps; seek clinical care during pregnancy and childbirth; avoid unregulated tattooing or piercing.
Knowing how HIV spreads is the clearest guide to stopping it.
This article is general information gathered from reputable public sources — not a substitute for advice from a qualified healthcare provider.