A molecular epidemiological study was conducted on 104 HIV-1 strains isolated from HIV-infected children hospitalized in Children Hospital 1 in Ho Chi Minh City, Vietnam during 2004-2005. Genetic subtyping based on env C2/V3 sequences revealed that CRF01-AE was the sole circulating recombinant form found in this study. Sequence analysis of the V3 loop showed that GPGQ tetramer was the most common V3 loop core motif identified in the HIV-1 strains studied (89.5%). The findings raise great concern about HIV-infected children in Vietnam and provide up-to-date molecular epidemiological information of HIV-1 circulating in Vietnam during the study period.
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