Understanding the Profile of HIV and AIDS: Causes and Symptoms

Few health conditions have shaped public health policy, social attitudes, and medical research as profoundly as HIV and AIDS. Despite decades of awareness campaigns, misconceptions still persist about what the virus actually does, how it spreads, and how it progresses inside the body. Understanding the profile of HIV and AIDS, from its origins in the early 1980s to the stage-wise decline of immunity it triggers, is essential for any student of population and family health. This post breaks down the science, the stages, the transmission routes, and the symptoms in a clear and structured way.

What HIV and AIDS actually mean 🔗

HIV stands for Human Immunodeficiency Virus. It is a retrovirus that selectively attacks CD4+ T lymphocytes, the white blood cells that coordinate the body’s immune response. AIDS, or Acquired Immunodeficiency Syndrome, is not a separate virus but the advanced clinical condition that develops when HIV has destroyed enough CD4 cells to leave the body defenceless against infections and certain cancers.

This distinction matters. A person can live with HIV for many years without developing AIDS, especially with timely antiretroviral therapy. AIDS is essentially the late-stage syndrome caused by untreated or poorly managed HIV infection.

The discovery in the early 1980s 🔗

The story of HIV’s identification begins in 1981, when doctors in New York and California started reporting clusters of rare conditions, including Kaposi’s sarcoma and Pneumocystis pneumonia, among otherwise healthy young men. Scientists initially suspected an unknown infectious agent. By September 1982, the condition was officially named Acquired Immune Deficiency Syndrome. In 1983, researchers at the Pasteur Institute in France isolated the virus responsible, and by 1986 the International Committee on Taxonomy of Viruses standardised the name to HIV.

Genetic studies suggest HIV crossed over to humans from chimpanzees carrying the Simian Immunodeficiency Virus (SIV), most likely in central Africa decades before the epidemic became visible. Two main types exist: HIV-1, which is responsible for the global pandemic, and HIV-2, which is rarer and less transmissible.

HIV’s arrival in India 🔗

India’s first HIV case was detected in 1986 among sex workers in Chennai. The Indian Council of Medical Research had begun screening high-risk groups using the ELISA test that same year, and the discovery confirmed that HIV had reached India. The government responded by establishing the National AIDS Committee in 1986 and launching the National AIDS Control Programme in 1987. In 1992, the National AIDS Control Organisation (NACO) was constituted under the Ministry of Health and Family Welfare to coordinate the national response.

The six stages of HIV and AIDS progression 🔗

HIV does not destroy the immune system overnight. It moves through a series of stages, each defined by changes in CD4 cell count, viral load, and clinical symptoms. The healthy CD4 count in an adult typically ranges between 500 and 1,500 cells per cubic millimetre of blood. As the infection progresses, this number falls.

Stage 1: Initial or acute infection 🔗

This stage begins within two to four weeks of exposure to the virus. The viral load is extremely high because HIV is replicating rapidly, and the CD4 count drops sharply. Many people experience flu-like symptoms during this window, including fever, sore throat, body ache, swollen lymph nodes, and rash. Some have no symptoms at all, which is one reason HIV often goes undetected at this stage. The person is highly infectious during this period.

Stage 2: Asymptomatic or clinical latency phase 🔗

After the immune system fights back, the viral load drops and the infection enters a long quiet phase. The person feels healthy and shows no outward signs of illness, but the virus continues to replicate slowly and steadily destroys CD4 cells. Without treatment, this stage can last anywhere from three to ten years. The CD4 count gradually slides from normal levels toward 500 cells per cubic millimetre. The danger here is that an untreated person can transmit HIV to others without realising they are infected.

Stage 3: Intermediate or symptomatic stage 🔗

As the CD4 count drops further, usually between 200 and 500 cells per cubic millimetre, the immune system starts struggling. The person begins to experience persistent symptoms such as low-grade fever, fatigue, unexplained weight loss, chronic diarrhoea, swollen lymph nodes, and recurring skin infections like herpes zoster (shingles) or fungal infections. Oral thrush is another common sign at this stage.

Stage 4: Advanced stage with opportunistic infections 🔗

When the CD4 count falls below 350 cells per cubic millimetre, opportunistic infections become more frequent. Tuberculosis is a particularly serious co-infection in the Indian context, where the disease burden is already high. Other common infections include bacterial pneumonia, persistent oral candidiasis, and chronic skin conditions.

Stage 5: AIDS stage 🔗

A formal diagnosis of AIDS is made when the CD4 cell count drops below 200 cells per cubic millimetre, or when the person develops one of the AIDS-defining opportunistic infections regardless of CD4 count. At this stage, the immune system is severely compromised. Conditions like Pneumocystis pneumonia, cryptococcal meningitis, cytomegalovirus infection, toxoplasmosis, and Kaposi’s sarcoma become real threats. Severe weight loss, also called HIV wasting syndrome, is common.

Stage 6: Terminal stage 🔗

In the final phase, the CD4 count falls below 50 cells per cubic millimetre. The body is no longer able to mount any meaningful defence. Multiple severe opportunistic infections occur simultaneously, neurological complications like HIV-associated dementia may develop, and organ systems begin to fail. Without antiretroviral therapy, death usually follows within a short period. This stage is largely preventable today with timely diagnosis and treatment.

How HIV spreads: the four main modes of transmission 🔗

HIV is fragile outside the human body and cannot survive long in open air. It spreads only through specific body fluids: blood, semen, vaginal and rectal fluids, and breast milk. According to NACO’s official guidance, there are four primary routes of transmission.

Unsafe sexual practices 🔗

Unprotected vaginal, anal, or oral sex with an infected person is the most common mode of HIV transmission worldwide and in India. The risk is higher when other sexually transmitted infections are present, as open sores or inflammation make it easier for the virus to enter the bloodstream. Consistent and correct use of condoms remains one of the most effective ways to prevent sexual transmission.

Transfusion of infected blood and blood products 🔗

Receiving blood or blood components from an infected donor can transmit HIV. India recorded its first transfusion-transmitted HIV case in Vellore in 1987, after which the government made HIV screening of donated blood mandatory. Today, the National Blood Transfusion Council ensures that every blood unit is screened for HIV, hepatitis B, hepatitis C, syphilis, and malaria before transfusion.

Mother-to-child transmission 🔗

An HIV-positive mother can pass the virus to her baby during pregnancy, during childbirth, or through breastfeeding. This is also called vertical or parent-to-child transmission. India’s Prevention of Parent to Child Transmission programme was launched in 2002 and now operates through thousands of Integrated Counselling and Testing Centres across the country. With antiretroviral prophylaxis, safe delivery practices, and appropriate infant feeding, the risk of vertical transmission can be reduced to less than five percent.

Intravenous drug use and contaminated needles 🔗

Sharing needles, syringes, or other injecting equipment with an infected person allows the virus to pass directly into the bloodstream. India has seen significant HIV spread among injecting drug users in the north-eastern states of Manipur, Mizoram, and Nagaland since the late 1980s, largely due to proximity to drug-trafficking routes from Myanmar. Needle and syringe exchange programmes and opioid substitution therapy are part of the harm-reduction strategy adopted under the National AIDS Control Programme.

It is equally important to know how HIV does not spread. Casual contact such as shaking hands, hugging, sharing food or utensils, using the same toilet, mosquito bites, or coughing and sneezing does not transmit the virus. Persistent stigma around these myths continues to hurt people living with HIV.

Symptoms and diagnosis 🔗

Symptoms of HIV vary widely depending on the stage of infection. In the acute phase, flu-like illness with fever, fatigue, and swollen glands is common. The long asymptomatic phase may produce no signs at all. As immunity declines, persistent fever, night sweats, recurring skin infections, oral thrush, chronic diarrhoea, and unexplained weight loss begin to appear. In the AIDS stage, opportunistic infections like tuberculosis, severe pneumonia, and certain cancers dominate the clinical picture.

Diagnosis is made through antibody tests like ELISA and rapid tests, confirmed by Western blot or follow-up rapid tests using NACO’s three-test strategy. Once diagnosed, CD4 count and viral load testing are used to stage the disease and monitor response to antiretroviral therapy. Early diagnosis is critical because treatment started in the early stages can keep a person healthy and reduce the risk of transmission to others.

Why this profile matters 🔗

Understanding the profile of HIV and AIDS is not merely a clinical exercise. It informs everything from public health policy and counselling services to community attitudes and family decisions. India has made significant progress in reducing new infections through sustained efforts by NACO, civil society, and healthcare workers, but stigma, late diagnosis, and gaps in treatment adherence remain real challenges. Knowing the stages, the transmission routes, and the symptoms empowers students, healthcare professionals, and community members to respond with accuracy rather than fear.

What do you think? If awareness about HIV transmission has been widely promoted for decades, why do you think stigma and misconceptions about the disease still persist in many Indian communities? And in your view, what role can college students play in shifting these attitudes?

References

1. https://www.beintheknow.org/understanding-hiv-epidemic/context/origin-hiv-and-aids
2. https://pmc.ncbi.nlm.nih.gov/articles/PMC3461712/
3. https://www.ncbi.nlm.nih.gov/books/NBK513289/
4. https://naco.mohfw.gov.in/faqs
5. https://www.sentinelassam.com/more-news/editorial/transfusion-transmitted-hiv-infection-in-india-3
6. https://naco.gov.in/elimination-vertical-transmission-hiv-syphilis
7. https://pmc.ncbi.nlm.nih.gov/articles/PMC13058364/