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Viral load differences in early infection with two HIV-1 subtypes
D J Hu1, S Vanichseni, T D Mastro
1Division of HIV/AIDS Prevention--Surveillance and Epidemiology, National Center for HIV, STD, and TB Prevention, Centers for Disease Control and Prevention (CDC), Atlanta, Georgia 30333, USA.
AIDS (London, England)
|May 24, 2001
Summary
Early HIV-1 infection with subtype E shows higher viral loads than subtype B, but immune responses remain similar. Transmission dynamics in Bangkok may influence these findings.
Area of Science:
- Virology
- Immunology
- Epidemiology
Background:
- Limited data exists on early Human Immunodeficiency Virus type 1 (HIV-1) infection beyond subtype B, particularly in non-Western regions.
- Understanding subtype-specific differences is crucial for effective HIV-1 management and prevention strategies.
Purpose of the Study:
- To compare virologic and immunologic parameters in recently HIV-1 infected individuals with subtype E versus subtype B.
- To investigate early disease progression and immune responses across different HIV-1 subtypes.
Main Methods:
- A prospective cohort study involving 130 HIV-1 seroconverters (103 subtype E, 27 subtype B) in Bangkok, Thailand.
- Serial measurements of HIV-1 RNA viral load, CD4 and CD8 T-cell counts, and natural killer cell percentages were conducted post-seroconversion.
Main Results:
- Individuals infected with HIV-1 subtype E exhibited significantly higher median RNA viral loads within 3 months of seroconversion compared to subtype B (63,100 vs. 18,050 copies/ml).
- Viral load differences diminished over 24 months, with similar levels observed between subtypes at later time points.
- CD4 and CD8 T-cell counts remained comparable between the two subtypes throughout the 24-month follow-up period.
Conclusions:
- Higher initial viral loads in subtype E infections may stem from intrinsic biological differences or local transmission dynamics in Bangkok.
- Despite initial viral differences, immune responses (CD4/CD8 counts) appear similar across subtypes, suggesting potential for comparable long-term outcomes.