Every day, more than one million people worldwide contract a sexually transmitted infection. These infections affect millions of lives, yet many remain unaware of the risks or even that they’re infected. Understanding STIs and HIV/AIDS is no longer just a public health concern-it’s essential knowledge that can protect you, your loved ones, and your community.
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What are STIs and HIV/AIDS?
Sexually transmitted infections are diseases spread primarily through sexual contact, including vaginal, anal, and oral sex. More than 30 different bacteria, viruses, and parasites can be transmitted this way, though eight pathogens cause the majority of infections worldwide.
These eight pathogens fall into two categories. Four are bacterial and can be cured with antibiotics: syphilis, gonorrhoea, chlamydia, and trichomoniasis. The other four are viral infections that cannot be cured but can be managed: hepatitis B, herpes simplex virus, HIV, and human papillomavirus.
HIV (Human Immunodeficiency Virus) deserves special attention. This virus attacks the body’s immune system, specifically targeting white blood cells that help fight infections. When left untreated, HIV can progress to AIDS (Acquired Immunodeficiency Syndrome), the most advanced stage of the infection where the immune system becomes severely damaged.
What makes STIs particularly dangerous is that many people show no symptoms, especially in the early stages. This silent spread means infected individuals can unknowingly transmit diseases to their partners. STIs can also increase the risk of HIV transmission, as infections like herpes or syphilis can cause sores or breaks in the skin that make it easier for HIV to enter the body.
The historical emergence of HIV/AIDS
While syphilis has plagued humanity for centuries, HIV/AIDS is a relatively recent epidemic that changed the world. The first cases of what would become known as AIDS were identified in June 1981 when doctors in Los Angeles, New York City, and San Francisco noticed unusual clusters of rare infections in young gay men-specifically Pneumocystis pneumonia and Kaposi’s sarcoma.
Initially called “gay cancer” or “gay pneumonia,” the disease baffled medical professionals. By 1982, it was officially named AIDS. The retrovirus causing AIDS was identified in May 1983 by researchers at Institut Pasteur in Paris, a discovery that earned Françoise Barré-Sinoussi and Luc Montagnier the 2008 Nobel Prize in Physiology or Medicine.
Scientists later traced HIV’s origins much further back. Research suggests that HIV crossed from chimpanzees to humans in Central Africa, possibly in the early 20th century. By 1959, confirmed HIV-related deaths were documented in the Congo, though the virus likely circulated in human populations even earlier.
The epidemic spread rapidly through the 1980s and 1990s. What began as isolated cases in a few American cities became a global pandemic. By the mid-1990s, improved treatments began to emerge, transforming HIV from a death sentence into a manageable chronic condition-though only for those with access to proper care.
The global burden of STIs and HIV/AIDS
The numbers are staggering. In 2020, there were an estimated 374 million new infections with just four curable STIs: chlamydia (129 million), gonorrhoea (82 million), syphilis (7.1 million), and trichomoniasis (156 million). This means more than one million people acquire a curable STI every single day.
The viral STIs add to this burden. Over 520 million people live with genital herpes, while an estimated 300 million women have HPV infections. As of 2024, approximately 40.8 million people were living with HIV globally, with 65% in the WHO African Region. In 2024 alone, 1.3 million people acquired HIV, and 630,000 died from AIDS-related causes.
India’s unique challenges
India faces a concentrated epidemic with its own distinct characteristics. As of 2019, India had an estimated 2.35 million people living with HIV, making it the country with the third-largest number of HIV cases globally, after South Africa and Nigeria. However, India’s adult HIV prevalence rate of 0.22% is relatively low compared to many other nations.
The epidemic in India is concentrated among specific high-risk populations: female sex workers, men who have sex with men, transgender individuals, and people who inject drugs. In India, sexual transmission accounts for 87.4% of reported HIV cases, with heterosexual transmission being the dominant route.
Geographic distribution varies significantly across Indian states. The northeastern states of Mizoram, Nagaland, and Manipur have the highest prevalence rates, while Maharashtra, Andhra Pradesh, and Karnataka have the largest absolute numbers of people living with HIV. The country also grapples with an estimated 6-9% STI prevalence in the general population, translating to roughly 40 million new infections annually.
Low literacy levels, particularly in rural areas, extensive labor migration, and low status of women contribute to India’s HIV burden. Many women acquire HIV from their regular partners who became infected through commercial sex, highlighting the bridging role between high-risk and general populations.
Routes of transmission and prevention
Understanding how STIs and HIV spread is the first step toward prevention. HIV transmits through exchange of body fluids from infected individuals-blood, breast milk, semen, and vaginal secretions. It can also pass from mother to child during pregnancy, childbirth, or breastfeeding. HIV does not spread through casual contact like kissing, hugging, or sharing food.
Other STIs spread through similar routes, primarily sexual contact. However, some like syphilis can also transmit through skin-to-skin contact with infected sores. The window period-the time between infection and when tests can detect it-poses particular challenges. For HIV, most people develop detectable antibodies within 28 days, but during this period, they can still transmit the virus to others.
Effective prevention strategies
Condom use: When used correctly and consistently, condoms offer one of the most effective methods of protection against STIs, including HIV. While not 100% effective, they significantly reduce transmission risk.
Testing and early diagnosis: Regular testing enables early detection and treatment. In India, the government has established Integrated Counselling and Testing Centers across the country, making HIV testing more accessible. Early diagnosis allows for timely treatment and prevents further transmission.
Pre-exposure prophylaxis (PrEP): HIV-negative individuals at high risk can take antiretroviral medications to prevent infection. WHO now recommends multiple PrEP methods, including oral medications, vaginal rings, and long-acting injectables.
Antiretroviral therapy (ART): For those living with HIV, consistent ART use can suppress the viral load to undetectable levels. People on ART with undetectable viral loads cannot transmit HIV to their sexual partners-a principle known as “undetectable equals untransmittable.”
Vaccination: Safe and effective vaccines exist for hepatitis B and HPV. These vaccines represent major advances in STI prevention, with HPV vaccination being crucial for preventing cervical cancer.
Education and awareness: Comprehensive sex education, awareness campaigns, and reducing stigma remain fundamental to prevention efforts. Many people, especially in areas with low literacy, lack basic knowledge about STI transmission and prevention.
The critical importance of early treatment
Untreated STIs lead to serious complications. Gonorrhoea and chlamydia can cause pelvic inflammatory disease in women, leading to infertility. Syphilis can damage the heart, brain, and other organs. HPV infection is responsible for over 311,000 cervical cancer deaths annually worldwide.
For HIV specifically, early treatment dramatically improves outcomes. India adopted the “test and treat” policy in 2017, meaning anyone who tests positive immediately becomes eligible for treatment regardless of their CD4 count. This approach helps people maintain stronger immune systems and reduces transmission to others.
The country provides antiretroviral drugs free of cost through government programs, operating 570 ART centers and 1,264 link ART centers. However, uptake remains low due to stigma, difficulties accessing clinics, and lack of awareness-challenges that need urgent attention.
Drug resistance, particularly to gonorrhoea antibiotics, poses an emerging threat. This makes prevention even more critical, as treatment options for some STIs are becoming limited.
What do you think? How can communities reduce the stigma around STI testing and treatment to encourage more people to seek early care? What role should schools and workplaces play in providing comprehensive sexual health education?
References
- https://www.who.int/news-room/fact-sheets/detail/sexually-transmitted-infections-(stis)
- https://www.who.int/news-room/fact-sheets/detail/hiv-aids
- https://hivinfo.nih.gov/understanding-hiv/fact-sheets/hiv-and-sexually-transmitted-infections-stis
- https://www.cdc.gov/museum/online/story-of-cdc/aids/index.html
- https://www.pasteur.fr/en/research-journal/news/40-years-hiv-discovery-first-cases-mysterious-disease-early-1980s
- https://naco.gov.in/hiv-facts-figures
- https://www.worldbank.org/en/news/feature/2012/07/10/hiv-aids-india
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