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2016-11-30
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SHORT COMMUNICATION: REASSESSING THE ORIGIN OF THE HIV-1 CRF02_AG LINEAGES CIRCULATING IN BRAZIL
Author
Affilliation
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de AIDS e Imunologia Molecular. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Nacional de Saúde da Mulher, da Criança e do Adolescente Fernandes Figueira. Departamento de Patologia Clínica. Laboratório de Virologia. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de AIDS e Imunologia Molecular. Rio de Janeiro, RJ, Brasil / Hospital Geral de Nova Iguaçu. Rio de Janeiro, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de AIDS e Imunologia Molecular. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de AIDS e Imunologia Molecular. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de AIDS e Imunologia Molecular. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Nacional de Saúde da Mulher, da Criança e do Adolescente Fernandes Figueira. Departamento de Patologia Clínica. Laboratório de Virologia. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de AIDS e Imunologia Molecular. Rio de Janeiro, RJ, Brasil / Hospital Geral de Nova Iguaçu. Rio de Janeiro, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de AIDS e Imunologia Molecular. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de AIDS e Imunologia Molecular. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de AIDS e Imunologia Molecular. Rio de Janeiro, RJ, Brasil.
Abstract
HIV-1 CRF02_AG is responsible for at least 8% of the HIV-1 infections worldwide and is distributed mainly in West
Africa. CRF02_AG has recently been reported in countries where it is not native, including Brazil. In a previous
study including 10 CRF02_AG Brazilian samples, we found at least four independent introductions and two autochthonous
transmission networks of this clade in Brazil. As more CRF02_AG samples have been identified in
Brazil, we performed a new phylogeographic analysis using a larger dataset than before. A total of 20 Brazilian (18
from Rio de Janeiro and two from Sa˜o Paulo) and 1,485 African HIV-1 CRF02_AG pol sequences were analyzed
using maximum likelihood (ML). The ML tree showed that the Brazilian sequences were distributed in five different
lineages. The Bayesian phylogeographic analysis of the Brazilian and their most closely related African sequences
(n = 212) placed the origin of all Brazilian lineages in West Africa, probably Ghana, Senegal, and Nigeria. Two
monophyletic clades were identified, comprising only sequences from Rio de Janeiro, and their date of origin was
estimated at around 1985 (95% highest posterior density: 1979–1992). These results support the existence of at least
five independent introductions of the CRF02_AG lineage from West Africa into Brazil and further indicate that at
least two of these lineages have been locally disseminated in the Rio de Janeiro state over the past 30 years.
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