HIV is found in body fluids of a person with the virus, whose levels of virus are detectable.
The body fluids most likely to contain enough virus to pass on HIV to another person are:
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semen (including pre-cum)
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vaginal fluid
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anal mucus
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blood
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breast milk
HIV is a fragile virus and does not survive outside the body for long.
HIV is most commonly passed on through unprotected (without a condom or PrEP) anal or vaginal sex, or by sharing syringes or needles when injecting drugs.
HIV can also be passed from an infected mother to baby during pregnancy or through breastfeeding, although if she is on medication, this can prevent transmission to the baby. Most women in Scotland who have HIV do not pass it on to their baby because they are on treatment.