In short
HIV is a manageable, lifelong condition today, not the emergency it once was. Modern treatment lets most people live long, healthy lives and, when the virus is suppressed, prevents transmission to partners.
Emergency if: A possible HIV exposure in the last 72 hours: go to an emergency department or sexual health clinic now and ask about PEP. It works best within 24 hours and does not work after 72.
On this page
01
What HIV Is
HIV is a virus that attacks the immune system, specifically CD4 cells that help fight infection. Without treatment it can gradually weaken the immune system over years, eventually reaching the advanced stage called AIDS. With today's treatment, most people diagnosed with HIV never progress to that stage and can expect a near-typical lifespan.
02
How It Spreads and Who Should Test
HIV spreads through specific body fluids — blood, semen, vaginal fluids, and breast milk — mainly through unprotected sex or shared needles, not through casual contact, sharing meals, or hugging. Testing is recommended at least once for all adults and more often for those with ongoing exposure risk; it's a routine, private health measure, and an earlier diagnosis simply means earlier access to treatment that works. After a possible exposure, such as sex without a condom with a partner whose status is unknown, or a needle injury, preventive medicine called post-exposure prophylaxis (PEP) can stop infection taking hold, but it must start within 72 hours, ideally within 24, so go to an emergency department or sexual health clinic now rather than waiting to test.
03
Symptoms
Early infection sometimes causes a brief flu-like illness with fever, rash, and swollen lymph nodes, though many people notice nothing at all. Without treatment, the virus can silently weaken immunity over years before symptoms of advanced disease appear. This silent phase is exactly why testing, not waiting for symptoms, is how most people learn their status.
04
Diagnosis
A blood or oral fluid test detects HIV antibodies or antigens, with rapid tests giving results in minutes and confirmatory lab tests used to verify a positive result. Regular blood work after diagnosis tracks CD4 cell counts and viral load, showing immune health and how well treatment is working over time.
05
Treatment, U=U, and Living With HIV
Daily antiretroviral therapy suppresses the virus to undetectable levels in the blood for most people who take it consistently, preserving immune function and preventing progression to AIDS. When the viral load stays undetectable, the well-established U=U principle — Undetectable equals Untransmittable — means the virus cannot be passed to sexual partners. HIV today is treated as a manageable, lifelong chronic condition, much like diabetes or high blood pressure, and an infectious disease specialist works with each person on the right regimen and ongoing care.
How urgent is it?
Emergency — act now
A possible HIV exposure in the last 72 hours: go to an emergency department or sexual health clinic now and ask about PEP. It works best within 24 hours and does not work after 72.
Same-day — call promptly
A positive self-test or rapid test: contact a doctor or testing centre today for a confirmatory lab test.
Routine — see a doctor
You have never been tested, or you have ongoing risk: book a routine HIV test.
Sources
- HIV/AIDS - MedlinePlusmedlineplus.gov
- HIV/AIDS - WHO Fact Sheetwho.int
- HIV and AIDS — NHSnhs.uk
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