What Is HIV?

HIV, or human immunodeficiency virus, is a virus that attacks the immune system, specifically the CD4 cells that help the body fight infections. Without treatment, HIV weakens the immune system over time and can progress to AIDS. HIV spreads through certain body fluids, including blood, semen, vaginal fluid, and breast milk. Thanks to modern treatment, people with HIV can live long, healthy lives, and treatment also prevents transmission to partners. The key is knowing your status, because many people with HIV have no symptoms for years. This guide explains HIV symptoms, how it spreads, how testing works, the window period, treatment, and prevention.

Symptoms

Many people with HIV have no symptoms for years, which is why testing is so important. Some people develop flu-like symptoms two to four weeks after exposure, including fever, sore throat, fatigue, swollen lymph nodes, and a rash. This is called acute HIV infection, and the symptoms usually fade within a few weeks.

After that, HIV can stay silent for years while it slowly weakens the immune system. As the infection progresses, symptoms can include weight loss, night sweats, recurring fevers, and frequent infections. The only way to know your HIV status is to get tested.

How It Spreads

HIV spreads through blood, semen, pre-seminal fluid, vaginal fluid, rectal fluid, and breast milk. The most common routes are unprotected vaginal or anal sex, sharing needles or syringes, and transmission from a pregnant person to their baby during pregnancy, birth, or breastfeeding.

HIV does not spread through casual contact. You cannot get it from hugging, shaking hands, sharing food, using the same toilet, or from mosquito bites. Saliva, sweat, and tears do not transmit the virus. Condoms and pre-exposure prophylaxis, or PrEP, greatly reduce the risk of sexual transmission.

Testing

HIV testing is a blood test, usually a finger prick or a blood draw. The most advanced option is a 4th generation test, which detects both HIV antibodies and the p24 antigen. This makes it one of the fastest tests to turn positive after exposure.

The window period depends on the test. A 4th generation test can detect HIV about two to four weeks after exposure, while antibody-only tests may take longer. If you test too early, you can get a false negative, so retesting after the window period is important. Knowing your status early means you can start treatment sooner, which protects your health and prevents transmission.

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Treatment and Cure

HIV is not curable, but it is highly manageable. Antiretroviral therapy, or ART, is a daily medication that keeps the virus at very low levels in the body. With treatment, most people with HIV reach an undetectable viral load, which means the virus cannot be transmitted sexually and the immune system stays strong.

Treatment works best when started early, so testing matters. People with HIV who take medication as prescribed can live nearly as long as people without HIV. There is no cure yet, but research continues, and current treatment is safe and effective for long-term health.

Prevention

Condoms used correctly during vaginal and anal sex are highly effective against HIV. PrEP, a daily pill taken by HIV-negative people, reduces the risk of infection by more than 99% when taken as prescribed. Never share needles or syringes, and use sterile equipment for any injections.

Regular testing is part of prevention, because people who know their status can get treatment and avoid passing the virus on. If you test positive, treatment that keeps your viral load undetectable means you cannot transmit HIV sexually. Talk openly with partners about testing and prevention.