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The changing molecular epidemiology of HIV type 1 among northern Thai drug users, 1999 to 2002.

Abstract：

:CRF01_AE and subtype B have dominated the HIV-1 epidemic in Thailand since 1989. We reported a new circulating recombinant form of HIV-1, CRF15_01B, as well as other unique CRF01_AE/B recombinants among prevalent HIV infections in Thailand. We sought to study this challenging molecular picture through assessment of subtypes among recent HIV-1 seroconverters in northern Thai drug users. A total of 847 HIV-1 seronegative drug users (342 IDU and 505 non-IDU) were enrolled, from 1999 to 2002, in a prospective study; 39 HIV-1 incident cases were identified and characteristics were collected. The overall HIV-1 incidence rate was 2.54/100PY, but it was 10.0/100PY among male IDU. HIV was strongly associated with injection history; 38 of 39 seroconverters gave a history of IDU. A near full-length genome of HIV-1 was recovered by PCR amplification and sequenced from peripheral mononuclear cell extracted DNA of 38 seroconverters. Phylogenetic analysis revealed that 33 (86.8%) were CRF01_AE and 5 (13.2%) were CRF01_AE/B recombinants. These recombinants had different structure but shared some common breakpoints, indicating an ongoing recombination process. Recombinant infection increased with year of sampling (0 to 57.1%). The molecular epidemiology of HIV-1 among drug users in northern Thailand has thus entered a new era. CRF01_AE remains predominant while pure subtype B is becoming rare, and now a substantial component of the epidemic. These findings support the need for CRF01_AE and subtype B components in clade-matched vaccine strategies for Thai phase III trials. Ongoing molecular surveillance of circulating HIV-1 strains is imperative for the evaluation of HIV vaccine efficacy.

journal_name

AIDS Res Hum Retroviruses

journal_title

AIDS research and human retroviruses

authors

Tovanabutra S,Beyrer C,Sakkhachornphop S,Razak MH,Ramos GL,Vongchak T,Rungruengthanakit K,Saokhieo P,Tejafong K,Kim B,De Souza M,Robb ML,Birx DL,Jittiwutikarn J,Suriyanon V,Celentano DD,McCutchan FE

doi

10.1089/088922204323087705

subject

Has Abstract

pub_date

2004-05-01 00:00:00

pages

465-75

issue

eissn

0889-2229

issn

1931-8405

journal_volume

pub_type

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The changing molecular epidemiology of HIV type 1 among northern Thai drug users, 1999 to 2002.