Which type of HIV is associated with slower disease progression?

Appeared in: AIIMS CRE 2025

Explanation

HIV-2 is characterized by a slower rate of disease progression compared to HIV-1.
Patients with HIV-2 infection typically exhibit lower plasma viral loads (viremia).
The decline in CD4+ T-cell counts is significantly slower in HIV-2 infection, leading to a much longer asymptomatic phase before the onset of AIDS.
HIV-2 is also less infectious and is transmitted less efficiently than HIV-1.

Option A: HIV-1 is the most common and virulent strain of the virus, associated with rapid disease progression to AIDS if untreated.
Option C: This is incorrect because HIV-1 and HIV-2 have distinctly different rates of disease progression. HIV-1 is significantly more aggressive.
Option D: This is incorrect as there is a well-documented difference in the clinical course of HIV-1 and HIV-2 infections.

Visual 1: Comparative Graph - A graph showing the typical decline of CD4+ T-cell counts over time in untreated HIV-1 vs. HIV-2 infection, illustrating the slower decline in HIV-2.
Visual 2: World Map - A map highlighting the geographical prevalence of HIV-1 (global) versus HIV-2 (predominantly West Africa).

Clinical Relevance

Nursing practice connection: Knowing Types and Pathophysiology of Human Immunodeficiency Virus (HIV) helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Differentiating between HIV-1 and HIV-2 is crucial for patient prognosis, counseling, and long-term management, as the expected disease course differs significantly.
Although HIV-2 progresses more slowly, it can still lead to AIDS. Therefore, patients require regular monitoring of CD4 counts and viral load, and may eventually need antiretroviral therapy (ART).
Nurses should be aware that some ART drugs, particularly non-nucleoside reverse transcriptase inhibitors (NNRTIs), are not effective against HIV-2.

How to Approach the Question

First, identify the key concept in the question, which is the 'rate of disease progression' related to different 'types of HIV'.
Recall the two main types of Human Immunodeficiency Virus: HIV-1 and HIV-2.
Access your knowledge about the characteristics of each type. Remember that HIV-1 is the globally dominant and more aggressive strain, responsible for the pandemic.
Contrast this with HIV-2, which is known to be less virulent and less common.
Based on this contrast, deduce that HIV-2 is the type associated with slower disease progression.
Evaluate the options to confirm your answer and eliminate the distractors.

Concept Tested & Keywords

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