HIV remains surrounded by myths, even though scientists have understood how the virus is transmitted for decades.
Some people unnecessarily avoid sharing food, bathrooms or living spaces with someone who has HIV. At the same time, others may underestimate situations where transmission can genuinely occur.
Understanding the facts helps people protect themselves without promoting fear, blame or discrimination.
HIV can be transmitted only through specific body fluids and under particular circumstances. It is not spread through ordinary social contact, saliva, sweat, tears, mosquitoes or sharing household items.
This guide explains how HIV is transmitted, how it is not transmitted and the practical steps that can reduce the possibility of infection.
What Is HIV?
HIV stands for human immunodeficiency virus. It attacks cells that help the immune system fight infections, particularly CD4 cells.
Without effective treatment, HIV can gradually weaken the immune system and may eventually progress to acquired immunodeficiency syndrome, commonly called AIDS.
However, HIV treatment has changed dramatically. People who receive effective antiretroviral treatment can live long, healthy lives. Treatment can also reduce the amount of HIV in the blood to an undetectable level, preventing sexual transmission of the virus.
For a basic introduction, read this earlier guide explaining what HIV is and how it affects the immune system.
Which Body Fluids Can Transmit HIV?
HIV can be present in certain body fluids from a person living with the virus.
The main fluids that may transmit HIV are:
Blood
Semen
Pre-seminal fluid
Vaginal fluids
Rectal fluids
Breast milk
For transmission to occur, one of these fluids must enter another person’s bloodstream or come into contact with vulnerable tissue, such as a mucous membrane or damaged skin.
Mucous membranes are found in areas such as the rectum, vagina, penis and mouth.
HIV is not transmitted through ordinary contact with saliva, sweat, tears, urine or faeces unless blood is present and there is a direct route into the bloodstream.
Sexual Transmission of HIV
Most HIV transmission worldwide occurs through sexual contact, particularly vaginal or anal sex when protective measures are not being used and the partner living with HIV has a detectable viral load.
Anal sex
Anal sex can carry a greater possibility of HIV transmission because the lining of the rectum is delicate and can be damaged during sex.
The receptive partner generally has a greater chance of acquiring HIV because rectal tissue can allow the virus to enter the bloodstream more easily.
The insertive partner may also acquire HIV through the opening of the penis, the foreskin or small cuts and sores.
Vaginal sex
HIV can also be transmitted through vaginal sex.
The virus may enter through the vaginal or cervical lining. A penis can also be exposed through the urethra, foreskin or small cuts.
The possibility of transmission can be influenced by several factors, including whether either partner has another sexually transmitted infection, whether condoms are used, whether the partner without HIV is taking PrEP and whether the partner with HIV has achieved viral suppression.
Oral sex
The possibility of acquiring HIV through oral sex is extremely low.
The chance may be increased by factors such as:
Blood in the mouth
Bleeding gums
Open sores
Mouth or genital ulcers
Ejaculation in the mouth
The presence of another sexually transmitted infection
Oral sex can transmit other sexually transmitted infections even when the possibility of HIV transmission is very low.
Can HIV Spread Through Kissing?
HIV is not transmitted through ordinary closed-mouth or open-mouth kissing.
Saliva does not transmit HIV. It also contains substances that make it difficult for the virus to remain infectious.
There have been exceptionally rare situations involving deep kissing where both people had significant open wounds or bleeding in the mouth. In such circumstances, the concern would be blood-to-blood contact, not saliva itself.
For everyday purposes, kissing, hugging and touching a person living with HIV do not transmit the virus.
Transmission Through Blood
HIV can be transmitted when blood containing the virus enters another person’s bloodstream.
Possible circumstances include:
Sharing needles or syringes
Sharing other equipment used to inject substances
Accidental needlestick injuries among healthcare workers
Receiving blood that has not been properly screened
Medical or cosmetic procedures involving improperly sterilised equipment
Sharing sharp instruments contaminated with fresh blood
Blood transfusion services in many countries screen donated blood for HIV. This has made transmission through properly screened blood extremely uncommon.
Healthcare facilities should also follow infection-prevention procedures, including safe injection practices, sterilisation and proper disposal of needles and other sharp instruments.
Tattoos, Piercings and Barbing Equipment
HIV transmission may be possible when equipment contaminated with infected blood is reused without proper sterilisation.
This may include:
Tattooing needles
Piercing equipment
Razors
Barbing instruments
Instruments used for traditional scarification
Equipment used during some cultural or religious procedures
The possibility is reduced when professionals use sterile, single-use equipment and follow appropriate infection-prevention procedures.
People should avoid sharing razors, needles or other objects that may contain blood.
Sharing Needles and Injecting Equipment
Sharing needles, syringes or other injecting equipment can provide a direct route for blood containing HIV to enter another person’s bloodstream.
Even when a needle appears clean, a small amount of blood may remain inside it.
Prevention measures include:
Never sharing needles or syringes
Using sterile equipment
Safely disposing of used needles
Accessing evidence-based harm-reduction services where available
Getting tested for HIV and viral hepatitis
Considering PrEP when clinically appropriate
This is not about judging people. Effective prevention focuses on reducing harm, improving access to healthcare and ensuring that people receive respectful support.
Mother-to-Child Transmission
A pregnant woman living with HIV can transmit the virus to her baby:
During pregnancy
During labour and delivery
Through breastfeeding
This is often called vertical transmission or mother-to-child transmission.
The possibility can be greatly reduced when HIV is diagnosed early and the mother receives effective antiretroviral treatment.
Other important measures include:
HIV testing during pregnancy
Taking HIV treatment consistently
Viral-load monitoring
Appropriate care during labour and delivery
Preventive medicine for the baby
Early infant HIV testing
Professional guidance on infant feeding
Pregnant women should not stop HIV treatment without speaking to a qualified healthcare professional.
With proper care, many women living with HIV give birth to babies who do not have HIV.
How HIV Is Not Transmitted
HIV cannot be transmitted through normal everyday interactions.
You cannot acquire HIV from:
Hugging
Handshakes
Sitting beside someone
Sharing food
Sharing plates, cups or cutlery
Sharing toilets or bathrooms
Sharing bedding
Swimming pools
Coughing or sneezing
Saliva
Sweat
Tears
Insect bites
Mosquito bites
Living or working with someone who has HIV
HIV does not reproduce in mosquitoes. When a mosquito bites a person, it injects saliva rather than the blood of someone it previously bit.
The virus also does not survive or reproduce effectively outside the human body. Touching surfaces, clothes or objects used by a person living with HIV does not transmit the virus.
Can HIV Spread Through Food?
HIV is not transmitted through food prepared or handled by someone living with HIV.
Sharing a meal, drinking from the same cup or using the same utensils does not place someone at risk.
The virus cannot survive the conditions involved in food preparation and digestion in a way that would cause transmission.
Excluding someone living with HIV from preparing food, eating with others or participating in household activities is unnecessary and discriminatory.
Factors That Can Increase the Possibility of HIV Transmission
The possibility of HIV transmission is not the same in every situation.
Factors that may increase it include:
A detectable viral load
A person with a high or detectable amount of HIV in the blood has a greater possibility of transmitting the virus than someone whose treatment has achieved sustained viral suppression.
Recent HIV infection
The amount of virus in the blood can be particularly high during the early stage of infection, sometimes before the person realises they have HIV.
Another sexually transmitted infection
Some sexually transmitted infections can cause inflammation, sores or tissue damage, which may make HIV transmission easier.
Inconsistent condom use
Correct and consistent condom use reduces the possibility of HIV and several other sexually transmitted infections.
Sharing injecting equipment
Sharing needles or syringes provides a direct route for blood-to-blood exposure.
Lack of PrEP
A person who may experience ongoing exposure to HIV may benefit from pre-exposure prophylaxis after assessment by a healthcare professional.
Poor adherence to HIV treatment
Missing treatment repeatedly may allow the viral load to rise, increasing health risks and the possibility of transmission.
Factors That Reduce or Prevent HIV Transmission
HIV prevention is most effective when people have access to several options and can choose what works for their circumstances.
Condoms
When used correctly and consistently, condoms reduce the possibility of HIV transmission and provide protection against several other sexually transmitted infections.
Condoms should be used from the beginning to the end of sex. Water-based or silicone-based lubricants can help reduce condom breakage and tissue injury.
HIV testing
Testing helps people know their status and make informed decisions.
A person who receives a positive screening result should complete the nationally approved confirmatory testing process before an HIV diagnosis is made.
A person who tests negative may receive information about the testing window period, repeat testing and prevention options.
A dedicated guide to HIV self-testing in Nigeria will be added here once published.
PrEP
PrEP stands for pre-exposure prophylaxis. It involves the use of HIV prevention medicine by a person who does not have HIV but may experience exposure to the virus.
PrEP may be available as tablets or long-acting injections, depending on national approval, availability and individual eligibility.
A complete guide to oral PrEP for HIV prevention will be linked here once published.
Long-acting prevention options are also developing. Read more about twice-yearly lenacapavir and its potential role in HIV prevention.
PEP
PEP stands for post-exposure prophylaxis. It is a short course of HIV medicines taken after a possible exposure to reduce the chance of infection.
PEP should be started as soon as possible and no later than 72 hours after a possible exposure. The sooner it is started, the better.
A person who may have been exposed should go promptly to a hospital, HIV treatment centre or another qualified healthcare provider. They should not wait for symptoms, because HIV may not cause immediate or noticeable symptoms.
Antiretroviral treatment
Antiretroviral treatment controls HIV and protects the immune system.
A person living with HIV who takes treatment as prescribed can reduce the amount of virus in the blood to very low levels.
This protects the person’s health and helps prevent transmission.
Viral suppression and U=U
When treatment reduces the amount of HIV in the blood to a level that standard laboratory tests cannot detect, the person has an undetectable viral load.
A person living with HIV who takes treatment and maintains an undetectable viral load does not sexually transmit HIV. This is known as Undetectable = Untransmittable, or U=U.
Undetectable does not mean cured. HIV treatment must continue for viral suppression to be maintained.
A detailed guide to viral suppression and U=U will be linked here once published.
Prevention of mother-to-child transmission
Early diagnosis, effective treatment, viral-load monitoring, infant preventive medicine and appropriate maternal and child healthcare can dramatically reduce transmission during pregnancy, delivery and breastfeeding.
When Should Someone Seek HIV Testing?
Consider seeking HIV testing when:
You have had vaginal or anal sex without a condom or another effective prevention method
A condom broke or slipped during sex
You shared needles, syringes or injecting equipment
You experienced sexual violence
You were exposed to another person’s blood
You have been diagnosed with another sexually transmitted infection
Your sexual partner has HIV and does not have a confirmed undetectable viral load
You are pregnant or planning a pregnancy
You want to know your status as part of routine healthcare
Testing should always be voluntary, confidential and accompanied by accurate information.
A healthcare professional can advise on the most appropriate test and whether repeat testing is needed because of the window period.
What Is the HIV Testing Window Period?
The window period is the time between possible HIV exposure and when a test can reliably detect the infection.
The length of the window period depends on the type of test used.
Some tests detect antibodies, while others detect both HIV antibodies and a part of the virus called the p24 antigen. Certain specialised tests can detect the virus itself.
A negative result obtained too soon after exposure may not be conclusive. A healthcare provider or trained tester can explain when repeat testing is appropriate.
What Should You Do After a Recent Possible Exposure?
After a possible exposure:
Do not panic.
Seek professional medical assessment immediately.
Ask whether PEP is appropriate.
Begin PEP as soon as possible when prescribed.
Complete the full course as directed.
Attend recommended HIV testing and follow-up appointments.
Discuss PrEP if similar exposure may happen again.
Do not delay care while trying to determine the other person’s HIV status yourself.
PEP must be started within 72 hours, and earlier initiation is preferable.
HIV Transmission in Nigeria
Nigeria has made progress in expanding HIV testing, treatment and prevention, but misinformation and stigma remain barriers.
Some people avoid testing because they fear rejection. Others may distance themselves from relatives, colleagues or neighbours living with HIV because they mistakenly believe the virus spreads through casual contact.
Accurate public information is therefore an important part of prevention.
Effective HIV programmes should combine:
Confidential testing
Prompt linkage to treatment
Access to condoms and PrEP
Prevention of mother-to-child transmission
Safe blood and injection practices
Community education
Stigma reduction
Viral-load monitoring
Support for treatment adherence
Prevention messages should focus on behaviours, exposures and available protection. They should not label entire groups of people as dangerous.
Frequently Asked Questions
Can HIV spread through kissing?
HIV is not transmitted through ordinary kissing. Saliva does not transmit HIV. Extremely rare concerns would involve significant blood exposure from open, bleeding wounds in both people’s mouths.
Can HIV spread through saliva?
No. HIV is not transmitted through saliva, sharing drinks, sharing utensils, coughing or sneezing.
Can mosquitoes transmit HIV?
No. HIV cannot reproduce inside mosquitoes, and mosquitoes do not inject another person’s blood when they bite.
Can HIV spread through oral sex?
The possibility is extremely low, but it may be increased by blood, mouth sores, genital sores or another sexually transmitted infection.
Can someone acquire HIV from a toilet seat?
No. HIV is not transmitted through toilet seats, bathrooms, bedding or shared household objects.
Can a person with HIV have sex without transmitting the virus?
Yes. A person living with HIV who takes treatment and maintains an undetectable viral load does not sexually transmit HIV. This is the basis of U=U.
Can a person look healthy and still have HIV?
Yes. A person may have HIV without visible symptoms. Testing is the only reliable way to know someone’s HIV status.
Does a negative HIV test always mean there is no HIV?
A negative result may need to be repeated when testing occurs during the window period. The appropriate timing depends on the test used and the date of possible exposure.
What should someone do after possible exposure to HIV?
Seek medical care immediately and ask about PEP. It must be started within 72 hours, and the sooner it is started, the better.
Is HIV curable?
There is currently no widely available cure for HIV. However, antiretroviral treatment can control the virus, protect health and enable people to live long and productive lives.
Final Thoughts
HIV is transmitted through specific exposures involving blood, semen, pre-seminal fluid, vaginal fluids, rectal fluids or breast milk.
It is not transmitted through hugging, kissing, sharing food, using the same bathroom, working together or living in the same home.
Knowing the difference between real transmission routes and common myths allows people to take appropriate precautions without discriminating against those living with HIV.
The most important prevention tools include testing, condoms, PrEP, PEP, sterile injecting equipment and effective HIV treatment.
Anyone concerned about a recent exposure should seek professional care promptly rather than waiting for symptoms.
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