What is the primary mode of HIV transmission in adults?

AIIMS CRE 2025

Medical & Surgical Nursing

Easy

Appeared in: AIIMS CRE 2025

Explanation

Sexual contact is the predominant mode of HIV transmission among adults globally, accounting for more than 75% of all cases.
Both heterosexual and homosexual contact can transmit the virus, with unprotected anal and vaginal intercourse carrying the highest risks.
The presence of other sexually transmitted infections (STIs) can significantly increase the risk of both acquiring and transmitting HIV.
Globally, heterosexual transmission is the most common way HIV is spread, making it the primary driver of the epidemic in many regions, particularly sub-Saharan Africa.

Option A: While the risk of transmission from a single unit of infected blood is extremely high (over 90%), this mode is now very rare in countries with routine, rigorous screening of the blood supply.
Option B: Sharing contaminated needles is a significant and efficient mode of transmission, but it accounts for a smaller percentage of total global infections compared to sexual contact. It is the primary mode for specific populations (people who inject drugs) but not for the adult population as a whole.
Option D: This route, also known as vertical transmission, occurs when the virus passes from a mother to her baby during pregnancy, childbirth, or breastfeeding. It is the primary way children become infected with HIV, not adults.

Visual 1: Infographic - A pie chart or bar graph illustrating the global percentage breakdown of HIV transmission routes (e.g., 75% sexual contact, 10% injecting drug use, etc.) to visually emphasize the dominance of sexual transmission.
Visual 2: Diagram - A simple diagram showing how HIV enters the body during unprotected sexual contact, highlighting the role of mucosal linings and the presence of the virus in seminal and vaginal fluids.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Modes of Human Immunodeficiency Virus (HIV) transmission as background academic context rather than a clinical decision trigger.
A nurse's primary role in HIV prevention is education. This includes teaching about safe sex practices, consistent condom use, and reducing the number of sexual partners.
Nurses are instrumental in promoting and managing biomedical interventions like Pre-Exposure Prophylaxis (PrEP) for high-risk individuals and Post-Exposure Prophylaxis (PEP) for accidental exposures.
Standard precautions are critical in healthcare settings. Nurses must handle needles and other sharps safely to prevent occupational exposure to HIV and other bloodborne pathogens.

How to Approach the Question

First, carefully read the question and identify the key terms: 'primary mode', 'HIV transmission', and 'adults'.
The term 'primary mode' asks for the most common or frequent route, not necessarily the most infectious per exposure.
The qualifier 'adults' is crucial, as it directs you to consider the epidemiology for the adult population and exclude routes that are primary for other groups (like infants).
Evaluate each option based on these criteria. Ask yourself: 'Is this the most common way adults get HIV worldwide?'
Recall or deduce that while blood transfusions are high-risk and needle sharing is significant in certain groups, sexual contact accounts for the largest number of infections globally.
Eliminate 'Mother-to-child transmission' as it applies to infants, not adults acquiring the infection.

Concept Tested & Keywords

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