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Southern Brazil HIV type 1 C expansion into the state of Sao Paulo, Brazil.

机译:巴西南部艾滋病毒1 C型感染扩展到巴西圣保罗州。

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Abstract HIV diversity reflects multifactorial evolutionary forces, but monitoring subtype prevalence may provide clues to understanding the epidemic. In the Americas HIV-1 C is present at significant levels only in the southern states of Brazil. We describe in this study the presence of the HIV-1 C pol genome in 11.6% (95 CI 6-21%) of antiretroviral-naive individuals from Sao Paulo, the major city of South America, and 6.8% (95 CI 4-12%) from the second metropolitan area of the State of Sao Paulo, Brazil. Moreover, a significant growth trend of this subtype was documented among cases failing therapy in the area. Sequences were obtained by direct nested PCR from cDNA retrotranscribed from plasma RNA. Phylogenetic and amino acid signatures support an expansion from variants previously identified in southern Brazil. The evaluation of additional genomic regions (partial gag, envelope, and/or integrase) in samples with HIV-1 C at pol showed extensive recombination with clade B, observed in 47% of ARV-naive cases. The spread of HIV-1 C locally and to other areas of South America should be monitored as it may influence the dynamics of the epidemic.
机译:摘要HIV多样性反映了多因素进化力,但监测亚型流行率可能为了解该流行病提供线索。在美洲,仅在巴西南部州,HIV-1 C的含量很高。在这项研究中,我们描述了来自南美主要城市圣保罗的11.6%(95 CI 6-21%)的抗逆转录病毒天真个体中HIV-1 C pol基因组的存在,以及6.8%(95 CI 4- 12%)来自巴西圣保罗州的第二大都市区。此外,在该地区治疗失败的病例中,该亚型有明显的增长趋势。通过直接巢式PCR从血浆RNA逆转录的cDNA获得序列。系统发生学和氨基酸特征支持以前在巴西南部发现的变体的扩展。在pol处带有HIV-1 C的样品中对其他基因组区域(部分gag,包膜和/或整合酶)的评估显示,与纯枝B发生了广泛重组,在47%的ARV初次感染病例中观察到。应该监测HIV-1 C在当地和向南美其他地区的传播,因为它可能影响该流行病的动态。

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