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The HIV virus cannot be transmitted through:

  • Unbroken healthy skin, because cells vulnerable to HIV infection do not exist on the surface of the skin.
  • Kissing, because HIV cannot be transmitted in saliva.
  • Coughing or sneezing, because HIV cannot be airborne. It is not present in the tiny particles of moisture sneezed or coughed out of someone's mouth.
  • Spitting, because HIV cannot be transmitted in saliva.
  • A healthy, undamaged mouth, because cells vulnerable to HIV infection are not present in the mouth.
  • Unbroken barriers, such as a latex condom or a female (internal) condom, because these barriers cannot be penetrated by HIV.
  • Mosquitoes, because although these insects suck blood, they do not regurgitate blood containing live HIV into the bodies of other victims.
  • Sharing cutlery, plates or cups, because HIV cannot be transmitted in saliva.
  • Social contact with people with HIV, because HIV is not transmitted by touch or through the air.
  • Through animal bites, because animals do not carry HIV.
  • By caring for people with HIV.
  • By donating blood in the UK.
  • By contact with small quantities of dried blood, because HIV will not be present in sufficient quantity (all infections through blood not injected or transfused have occurred where large quantities of blood splashed onto the broken skin of other people).
  • Through swimming pools, showers, washing machines, because HIV will be killed by chemicals in disinfectant and detergent, or simply just washed away.
  • By mouth-to-mouth resuscitation, because HIV is not present in saliva.
  • By touching objects such as telephones, because HIV is not transmitted by touch.
  • By using the same lavatory as people with HIV, because even if someone had bled into the lavatory, the water would immediately dilute the virus. Nor would HIV be picked up from blood on the lavatory seat.

Over-broad and imprecise categories such as 'sex' or 'promiscuity' or 'drug abuse' are not in themselves a risk.

Click here to find out more about HIV transmission.

Roger Pebody

Roger Pebody

Commissioning Editor

Roger joined aidsmap in 2008 and was Managing Editor from 2018 to 2024. As a freelancer, he now edits aidsmap’s news and conference coverage, as well as working on updates to About HIV pages. He is also a contributing science editor for TheBodyPro, a freelance journalist for The Lancet HIV, and a medical writer helping researchers prepare articles for peer-reviewed journals. He began working on HIV at Gay Men Fighting AIDS in the mid-1990s.

Basic informaton

How is HIV transmitted?

Two men embracing.

How is HIV not transmitted?

A couple kissing.

Can mosquitoes transmit HIV?

A close-up of a mosquito sitting on a hand, with a green background.

Transmission facts

Transmission facts

Myths and facts

Myths and facts

Is HIV man-made?

An illustration of an HIV virus.

What does undetectable = untransmittable (U=U) mean?

Domizia Salusest | www.domiziasalusest.com

Undetectable = Untransmittable (U=U)

U=U leaflet front cover

I’m living with HIV. Can I have sex without a condom?

We’re both living with HIV. Can we have sex without a condom?

I’m starting a relationship with someone who has HIV. What do I need to know?

Transmission and the law

Transmission and the law

HIV transmission

Illustration of purple HIV viruses on a white background.

Undetectable viral load and HIV transmission

Mareike Günsche | www.aspect-us.com

Condoms

Image: sirtravelalot/Shutterstock.com

How to use condoms and lubricant

Image: kittiwat chaitoep/Shutterstock.com

Female condoms for anal sex

One man standing behind another, removing the jeans from the man in front.

Post-exposure prophylaxis (PEP)

A white pill bottle is tipped over with blue pills spilling out on to a wooden table., along with white pills.

Oral sex and HIV

Image: NDAB Creativity/Shutterstock.com

Sex toys and the risk of HIV transmission

fizkes/Shutterstock.com

Estimated HIV risk per exposure

Image: Kateryna Kon/Shutterstock.com

HIV in the UK

Two older men talk to each other in a garden.

Harm reduction

Naloxone at a needle exchange in Birmingham, UK. Nigel Brunsdon/nigelbrunsdon.com

Anal sex and the risk of HIV transmission

One man standing behind another, removing the jeans from the man in front.

Vaginal sex and the risk of HIV transmission

Image: oneinchpunch/Shutterstock.com

Oral sex and the risk of HIV transmission

Image: VladOrlov/Shutterstock.com

Female-to-female sexual transmission of HIV

Image: weedezign/Shutterstock.com

Do condoms work?

Image: kittiwat chaitoep/Shutterstock.com

Needlestick injuries, discarded needles and the risk of HIV transmission

Image: funnyangel/Shutterstock.com

Where did HIV come from?

Democratic Republic of the Congo. Image by Christina Bergey. Creative Commons licence.