What is HIV & AIDS? Symptoms, Transmission, and More
Key Takeaways
- HIV is a virus that weakens the immune system, while AIDS is the most advanced stage of untreated HIV infection.
- Early signs often resemble the flu and are easy to miss, making testing the only reliable way to know your status.
- With modern antiretroviral therapy, HIV is a manageable condition. People who start treatment early can live long, healthy lives and will not transmit the virus to sexual partners.
Table of contents
What is HIV, and how serious is it in our modern times? According to the World Health Organization, an estimated 40.8 million people were living with HIV/AIDS globally at the end of 2024. Of those, 87% knew their status, which is significant as it means roughly 5.3 million people are carrying the virus without knowing it.
The good news is that most people who test positive today can live full, healthy lives with proper treatment. In this guide, we’ll cover what AIDS is, how HIV spreads, the early signs of HIV to watch for, and what to do if you think you’ve been exposed.
What Is HIV?
HIV stands for Human Immunodeficiency Virus. It attacks CD4 cells, the white blood cells responsible for coordinating the immune response. Over time, the virus destroys enough of these cells that the body can no longer fight off infections effectively.
HIV is often conflated with AIDS, but there is an important distinction: HIV is the virus, whereas AIDS is the most advanced stage of untreated HIV infection. Fortunately, HIV’s progression to AIDS can be prevented entirely with antiretroviral therapy.
Historically, how HIV started originated from SIV, a related virus found in chimpanzees. The cross-species transfer has been traced to central Africa, likely through exposure to infected blood during hunting. The earliest confirmed human case dates to a 1959 blood sample from Kinshasa, Democratic Republic of Congo.
How Does HIV Spread?
HIV is transmitted through blood, semen, rectal fluids, vaginal fluids, and breast milk. It mainly spreads through unprotected vaginal or anal sex, sharing needles, and mother-to-child transmission during pregnancy, childbirth, or breastfeeding.
Importantly, HIV is not spread through casual contact. Hugging, sharing food, using the same toilet, or being around someone who coughs or sneezes does not transmit the virus. This ties into a significant development in HIV prevention, where people on antiretroviral therapy who maintain an undetectable viral load do not transmit HIV to sexual partners. This is known as U=U: Undetectable = Untransmittable.
That said, can you get HIV from oral sex? The risk is low but not zero. Open sores, bleeding gums, and a high viral load increase the risk, but it’s still significantly lower risk than vaginal or anal sex. In the same vein, can you get HIV from kissing? No. HIV is not transmitted through saliva, and the CDC notes that the risk of transmission would require both partners to have open sores or bleeding gums, and even then, documented cases are virtually nonexistent.
What Is Usually the First Sign of HIV?
Many people with HIV have no noticeable HIV symptoms for years. Without testing, infection can go undetected for a decade or more.
When early symptoms do appear, they typically show up 2 to 4 weeks after exposure. This stage is called acute HIV infection, and the symptoms resemble a common flu:
- Fever
- Headache
- Sore throat
- Rash
- Swollen lymph nodes
- Muscle aches
- Fatigue
These signs of HIV are easy to dismiss. They last a few days to a few weeks, then resolve on their own. Most people never connect them to HIV.
After the acute phase, HIV enters chronic infection. The virus replicates at low levels with few or no symptoms. Without treatment, this stage can last for years before progressing to AIDS. Later-stage signs include persistent fatigue, unexplained weight loss, recurring fevers, and frequent infections.
What Is AIDS and How Is It Different from HIV?
AIDS stands for Acquired Immunodeficiency Syndrome. It’s diagnosed when a person’s CD4 count drops below 200 cells/mm³ or when they develop specific opportunistic infections like tuberculosis, cryptococcal meningitis, Pneumocystis pneumonia, or cancers like Kaposi’s sarcoma and lymphoma.
AIDS may also present with symptoms such as rapid weight loss, persistent fever, chronic diarrhea, extreme fatigue, swollen lymph nodes, and recurrent infections. AIDS is not inevitable, but rather the result of untreated HIV over many years. With early diagnosis and consistent antiretroviral therapy, it’s preventable.
Can HIV Be Cured?
No cure currently exists. However, antiretroviral therapy suppresses the virus to undetectable levels. People on effective ART have a normal or near-normal life expectancy, don’t develop AIDS, and don’t transmit the virus to sexual partners.
For HIV-negative people at risk, PrEP reduces the chance of acquiring HIV by about 99% when taken consistently. PEP is an emergency course of antiretroviral medication taken within 72 hours of potential exposure.
In June 2025, the FDA approved lenacapavir as the first twice-yearly injectable PrEP option. In Phase 3 trials published in the New England Journal of Medicine, over 99.9% of participants who received lenacapavir remained HIV-negative. Science magazine named it its 2024 Breakthrough of the Year.
Who Should Get Tested and How Often?
Testing is the only way to know your HIV status. Most people with HIV have no HIV symptoms, especially in the early years.
The CDC recommends that everyone aged 13 to 64 get tested at least once. People at higher risk, including those with new or multiple partners, people who share needles, and anyone diagnosed with another STI, should test at least annually or every 3 to 6 months.
Most fourth-generation antigen/antibody tests detect HIV within 18 to 45 days after exposure. Nucleic acid tests can detect it within 10 to 33 days. Same-day results are available through rapid diagnostic tests.
Get Tested at H.U.M. Clinic Bangkok Today
While it might sound daunting, HIV is manageable with early detection and treatment, which protects both your health and your partners while opening the door to treatments that can keep the virus fully suppressed for life. For everyone, knowing your status is the most important thing you should do.
H.U.M. Clinic offers confidential STD and STI testing in Bangkok with same-day results, English-speaking doctors, and laboratory services accredited under ISO 15189:2022 and QCMD 2024 standards. We handle every test with discretion, accuracy, and care to give you peace of mind.
Book your confidential HIV and STI test at H.U.M. Clinic Bangkok today. Contact us via LINE, WhatsApp, phone at 098 983 2949, or email at info@hum-clinic.com. Our clinic is conveniently located near BTS Asok and MRT Sukhumvit, and we’re always here to help you.
References
- HIV data and statistics. Retrieved 1 April 2026, from https://www.who.int/teams/global-hiv-hepatitis-and-stis-programmes/hiv/strategic-information/hiv-data-and-statistics
- Global HIV & AIDS statistics: Fact sheet. Retrieved 1 April 2026, from https://www.unaids.org/en/resources/fact-sheet
- Origins of HIV and the AIDS Pandemic. Retrieved 1 April 2026, from https://pmc.ncbi.nlm.nih.gov/articles/PMC3234451/
- About HIV. Retrieved April 2026, from https://www.cdc.gov/hiv/about/index.html
- The Stages of HIV Infection. Retrieved 1 April 2026, from https://hivinfo.nih.gov/understanding-hiv/fact-sheets/stages-hiv-infection
- Symptoms of HIV. Retrieved 1 April 2026, from https://www.hiv.gov/hiv-basics/overview/about-hiv-and-aids/symptoms-of-hiv
- The Global HIV/AIDS Epidemic. Retrieved 1 April 2026, from https://www.kff.org/global-health-policy/the-global-hiv-aids-epidemic/
- HIV and AIDS Epidemic Global Statistics. Retrieved 1 April 2026, from https://www.hiv.gov/hiv-basics/overview/data-and-trends/global-statistics
- Yeztugo (lenacapavir) FDA Approval for PrEP. Retrieved 1 April 2026, from https://www.gilead.com/news/news-details/2025/yeztugo-lenacapavir-is-now-the-first-and-only-fda-approved-hiv-prevention-option-offering-6-months-of-protection
- FDA approval of injectable lenacapavir marks progress for HIV prevention. Retrieved 1 April 2026, from https://www.who.int/news/item/19-06-2025-fda-approval-of-injectable-lenacapavir-marks-progress-for-hiv-prevention
Frequently Asked Questions About HIV
Q1: What is usually the first sign of HIV?
Flu-like symptoms, including fever, sore throat, rash, and swollen lymph nodes, typically appear 2 to 4 weeks after exposure. They’re mild, resolve quickly, and are easy to miss. Some people have no symptoms at all, so testing is the only reliable way to know.
Q2: Can you get HIV from kissing or oral sex?
HIV is not transmitted through saliva, so kissing carries no meaningful risk. Oral sex carries a very low risk, though factors like open sores and high viral load can increase it.
Q3: What is the difference between HIV and AIDS?
HIV is the virus. AIDS is the most advanced stage of untreated HIV, defined by a CD4 count below 200 or the presence of specific opportunistic infections. With early treatment, AIDS is preventable.
Q4: Can HIV be cured with treatment?
There is no cure, but antiretroviral therapy (ART) suppresses the virus to undetectable levels. People on effective ART live normal, healthy lives and do not transmit HIV to sexual partners.
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