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1996-02-26
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Document 1072
DOCN M9621072
TI The evolving molecular epidemiology of HIV-1 envelope subtypes in
injecting drug users in Bangkok, Thailand: implications for HIV vaccine
trials.
DT 9602
AU Kalish ML; Baldwin A; Raktham S; Wasi C; Luo CC; Schochetman G; Mastro
TD; Young N; Vanichseni S; Rubsamen-Waigmann H; et al; Division of
HIV/AIDS, Centers for Disease Control and Prevention,; Atlanta, Georgia
30333, USA.
SO AIDS. 1995 Aug;9(8):851-7. Unique Identifier : AIDSLINE MED/96014957
AB OBJECTIVE: To genetically characterize HIV-1 strains in injecting drug
users (IDU) in Bangkok, Thailand in 1994, and compare these with strains
found earlier in Thai IDU; such information is essential for HIV-1
vaccine development and evaluation. METHODS: Peripheral blood
mononuclear cells were collected from 84 IDU attending 14 drug treatment
clinics in Bangkok in 1994. DNA was amplified using a nested polymerase
chain reaction (PCR) procedure and sequenced directly (without cloning)
from the PCR products. The V3 and flanking regions (345 nucleotides) of
the env gene were analyzed using a neighbor-joining tree. RESULTS: Only
one (1%) strain was a typical subtype B virus, 69 (82%) were genetically
distinct subtype B' viruses (Thai B), and 14 (17%) were subtype E
strains (Thai A). Persons with recently acquired infection were more
likely to have subtype E viruses (P < 0.001) than those in our 1991
survey, who were more likely to have subtype B' viruses. Pairwise
intra-subtype differences within subtypes E and B' were 5.3 and 4.3%,
respectively, compared with 3.4 and 3.5% among strains collected in 1991
in Thailand. CONCLUSION: The genetic diversity within subtypes B' and E
in Thailand and the proportion of new infections due to subtype E
viruses among Bangkok IDU are increasing significantly. These data
highlight the importance of monitoring the molecular epidemiology of
HIV-1 in populations being considered for HIV-1 vaccine trials.
DE Amino Acid Sequence AIDS Vaccines/PHARMACOLOGY Base Sequence Clinical
Trials DNA Primers/GENETICS DNA, Viral/GENETICS Epidemiology,
Molecular Female *Genes, env Glycosylation Human HIV Envelope
Protein gp120/CHEMISTRY/GENETICS HIV
Infections/*COMPLICATIONS/EPIDEMIOLOGY/*VIROLOGY
HIV-1/*CLASSIFICATION/*GENETICS/ISOLATION & PURIF Male Molecular
Sequence Data Phylogeny Sequence Homology, Amino Acid Substance
Abuse, Intravenous/*COMPLICATIONS/*VIROLOGY Thailand/EPIDEMIOLOGY
Variation (Genetics) JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).