HIV can only transmit through specific bodily fluids, including blood, semen, and vaginal fluids. Treatment can reduce levels of the virus in a person with HIV so that it effectively becomes undetectable. When this happens, transmission cannot occur.
There are many myths about HIV transmission, and it is important to know the facts. Understanding how a person can and cannot acquire HIV helps prevent transmission and reduces the discrimination and stigma relating to HIV.
The number of new HIV diagnoses and the effect of the virus in the United States are decreasing due to effective preventive measures and treatments.
For example, antiretroviral therapy can reduce the amount of virus in the body to undetectable levels. When this occurs, the virus cannot harm the body or pass on to another person.
This article discusses how HIV does and does not transmit and how to help prevent it from passing on.
HIV can only pass on through certain
- rectal fluids
- vaginal fluids
- breast milk
Blood can carry more of the virus than other bodily fluids. Therefore, the greatest likelihood of transmission involves exposure to blood containing the virus.
However, HIV does not pass on through all contact with fluids carrying the virus. For transmission to occur, the fluid must
If blood containing HIV comes into direct contact with another person’s bloodstream, such as through an injection with a shared needle, this is
HIV can pass to a baby during pregnancy, birth, or nursing. However, this is
According to the Centers for Disease Control and Prevention (CDC), HIV is
- insect bites, including those from mosquitoes and ticks
- the air
- contact with saliva, tears, or sweat
- shaking hands, hugging, or closed-mouth kissing
- sharing toilets, dishes, or utensils
- eating food that someone with HIV has handled or prepared
- sexual activities that do not involve fluid exchange, such as touching
HIV cannot survive long outside the body, so it does not transmit via surfaces.
Additionally, the risks of contracting the virus through other methods of exposure, such as biting, scratching, and throwing bodily fluids, are either very small or nonexistent.
There is also
- Oral sex: However, having mouth ulcers, genital sores, or bleeding gums can increase the risk of transmission, as can having existing sexually transmitted infections (STIs).
- Workplace exchanges: However, a puncture from a needle or another sharp object that contains the virus can lead to transmission.
- Blood transfusion or donated organs: Current screening practices in the United States are safe and undergo stringent regulation, making this transmission highly unlikely.
- Deep, open-mouth kissing: Transmission in this way is very rare, but it can occur if both people have oral sores or bleeding gums.
- Tattoos and body piercings: There have been no reports of transmission from tattoos or piercings in the United States, although it is possible if the equipment or ink has been in contact with someone else’s blood.
HIV and AIDS resources
For more in-depth information and resources on HIV and AIDS, visit our dedicated hub.
Anyone can contract HIV, but several factors increase the risk. These
- sharing equipment for injecting drugs
- getting a tattoo with a shared needle or shared ink
- having anal or vaginal sex without a condom
- having an STI
- having frequent exposure to fluids containing the virus, such as in laboratory, medical, or emergency settings
- using drugs and alcohol, which can impair judgment
- having exposure to the virus during childbirth, pregnancy, or nursing
HIV affects certain U.S. populations more than others, including:
- Black and Latinx people
- cisgender and
transgendermales who have sex with cisgender males
- transgender females
In 2021, the latest year for which figures are available, males who had sex with other males received
In 2021, Black people received
The prevalence of HIV differs by U.S. region. In 2021, the South had the largest number of people living with HIV. However, in terms of its population size, the Northeast had the largest rate of individuals living with HIV.
What about breastfeeding or chestfeeding?
According to the World Health Organization (WHO), a person who has acquired HIV and receives no treatment has a
Antiretroviral therapy can reduce the chances of transmission to below 2% during pregnancy. However, nursing while receiving antiretroviral therapy is
Some social factors that influence a person’s risk of HIV transmission include:
- access to education about HIV transmission and prevention
- access to affordable healthcare
- discrimination and stigma in healthcare and society at large
- reduced negotiating power due to sex, gender, and financial or other status factors
Increased awareness of and access to antiretroviral therapy, preventive medication, and support services are effective ways to reduce the effects of HIV.
A range of effective strategies can now lower the risk of contracting HIV. These
- using preexposure prophylaxis (PrEP), a preventive drug
- never sharing needles with another person
- using condoms during sex
- getting frequent
HIV testingas per CDC recommendations using glovesand other sterile equipment in medical settings
- taking emergency postexposure prophylaxis after possible exposure to the virus
When a person takes PrEP daily, it
The Preventive Services Task Force updated its HIV guidelines in 2023. These guidelines recommend PrEP to all people at high risk of exposure to HIV or at high risk of acquiring HIV.
Anyone with HIV who is pregnant or plans to conceive should discuss ways to mitigate the
Due to advances in prevention and treatment, the number of new HIV cases in the United States has decreased by more than two-thirds since the mid-1980s.
Undetectable equals untransmittable
Using antiretroviral therapy consistently as a doctor prescribes can reduce the risk of transmission to virtually zero. It slows or stops the activity of HIV in the body.
Health experts consider the virus suppressed when someone with HIV has a viral load of 200 copies per milliliter of blood or under. It may be undetectable at this level or under, meaning it cannot transmit to others. However, it is important to keep following a treatment plan and attend regular check-ups to ensure that the viral load remains undetectable.
Many people with HIV experience no symptoms. A person can only know their HIV status by taking a test.
The CDC recommends that everyone ages
Early testing, diagnosis, and treatment are the most effective ways to stop the progression and transmission of the virus.
Frequent testing is an inexpensive and effective way to stop the spread of HIV. It is especially important to test:
- when planning to become pregnant
- after becoming pregnant
- before having sex with a new partner
People with a high risk of contracting the virus, including gay and bisexual males who are sexually active and sex workers, may wish to undergo testing every 3–6 months.
Individuals should undergo testing once a year or more if:
- their partners have HIV
- they share drug injection equipment with others
- have had hepatitis, tuberculosis, or an STI
What are the odds of contracting HIV?
The CDC provides a risk estimation tool featuring up-to-date evidence in its analysis. It helps a person determine their risk of contracting HIV from various activities.
Below are some commonly asked questions about HIV transmission.
How quickly can HIV be transmitted?
HIV can be transmitted as quickly as having
What is considered an open wound for HIV transmission?
HIV transmission can occur via any open cuts or sores and mucus membranes, which include the rectum, vagina, mouth, or tip of the penis.
How much blood is needed to transmit HIV?
The amount of blood needed to transmit HIV is not easily quantifiable. This is because it depends on various factors, including the viral load of the person with HIV, the type of exposure, and the susceptibility of the recipient.
However, HIV transmission typically requires a sufficient quantity of infected bodily fluids,
In the context of blood transfusions or needle-sharing, even a small amount of blood with a high viral load can
Can you still have sex with HIV?
A person with HIV can still have sex. To
HIV is only transmissible in certain situations, such as through contact with blood, rectal fluids, vaginal fluids, breast milk, and semen or pre-ejaculate.
There are several ways to reduce the risk of contracting HIV, including using condoms when having sex, taking PrEP, and never using shared needles.
In the United States, HIV has had a disproportionate effect on certain groups, including Black and Latinx people and cisgender and transgender males who have sex with cisgender males.
However, with modern antiretroviral therapy, fewer people contract HIV. Those with continuous access to this treatment are able to live long, healthy lives, and the risk of transmission is significantly reduced, often to zero.