Geographic origin of AIDS pandemic identified

HIV (human immunodeficiency virus) is a virus that attacks the immune system, specifically targeting CD4 T cells — the white blood cells that coordinate the body's defence against infection. Without treatment, HIV progressively weakens the immune system until it can no longer fight ordinary infections and certain cancers, a stage known as (acquired immunodeficiency syndrome). With modern antiretroviral therapy, HIV is a manageable chronic condition: people with HIV on treatment live near-normal lifespans and cannot transmit the virus to sexual partners.

How HIV Transmits

HIV is present in blood, semen, vaginal and rectal fluids, and breast milk. Transmission requires one of these fluids to enter another person's body through:

• Unprotected vaginal or anal sex with an infected person (the most common route)
• Sharing needles, syringes, or injection equipment
• Mother to child during pregnancy, birth, or breastfeeding
• Blood transfusion or organ transplant from an infected donor (now very rare in countries with blood screening programmes)

HIV does not spread through air, water, saliva, sweat, tears, casual touch, sharing food utensils, toilet seats, insect bites, or coughing and sneezing.

Prevention Methods

• Condoms: used consistently and correctly, male and female condoms are highly effective at preventing HIV transmission.
• PrEP (pre-exposure prophylaxis): daily oral tenofovir/emtricitabine (or injectable cabotegravir) reduces HIV acquisition risk by over 99% in people at high ongoing risk.
• PEP (post-exposure prophylaxis): a 28-day antiretroviral course taken within 72 hours of potential exposure can prevent HIV infection. It must be started as soon as possible.
• Harm reduction programmes: needle-and-syringe exchange and opioid substitution therapy significantly reduce HIV transmission among people who inject drugs.
• PMTCT (prevention of mother-to-child transmission): antiretroviral therapy during pregnancy and delivery reduces mother-to-child HIV transmission to under 1%.

Clinical guidance from CDC^[1] stresses matching home care to symptom severity and seeking urgent review when red-flag signs appear.

Testing: Why It Matters

Approximately 30% of people with HIV globally are unaware of their status. Early diagnosis is critical because treatment works best when started before immune damage accumulates. HIV antibody tests are accurate and widely available through clinics, hospitals, and home test kits. Most people develop detectable antibodies within 23–90 days of exposure (the window period).

Living With HIV Today

Modern antiretroviral therapy (ART) consists of one pill once daily for most people. When started promptly and taken consistently, ART suppresses viral load to undetectable levels, preserves immune function, and prevents AIDS-defining illnesses. People on ART do not need special diets, need not avoid ordinary social contact, and can have children safely with appropriate medical support.

For verification and deeper reading, WHO^[2] offers independent, evidence-based information you can cross-check with your own clinician.

Where to Get Help

• Government and NGO-run HIV testing and counselling (HTC) centres
• Any primary care or sexual health clinic
• National AIDS control organisations (NACO in India)
• iCall, Vandrevala Foundation, or local services for HIV-related psychological support