Genetic characterization of St. Louis encephalitis virus isolated from human in São Paulo, Brazil

Autor(es)

Cecília Luiza Simões dos Santos ^[1] ; Maria Anice Mureb Sallum ^[2] ; Heitor Moreira Franco ^[3] ; Fabíola Maiumi Oshiro ^[4] ; Iray Maria Rocco ^[5]

Afiliação do(s) autor(es)

^[1] Instituto Adolfo Lutz - Brasil

^[2] Universidade de São Paulo. Faculdade de Saúde Pública. Departamento de Epidemiologia - Brasil

^[3] Instituto Adolfo Lutz - Brasil

^[4] Instituto Adolfo Lutz - Brasil

^[5] Instituto Adolfo Lutz - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Memórias do Instituto Oswaldo Cruz; v. 101, n. 1, p. 57-63, 2006-02-00.

Resumo

The molecular characterization of SPH253157, a new strain of St. Louis encephalitis virus (SLEV), isolated in 2004 from the first case of human infection recognized in the state of São Paulo, Brazil, is reported. The patient, presenting a febrile illness without neurological involvement, was hospitalized as a probable case of dengue fever. Genomic RNA was isolated from the supernatant of C6/36 cells infected with acute phase-serum specimen of the patient and the envelope gene was amplified by reverse-transcription-polymerase chain reaction. The complete nucleotide sequence of the envelope gene of this isolate was directly sequenced from the amplified products and compared with other Brazilian and American SLEV strains. Phylogenetic analyses were carried out under maximum likelihood criterion with outgroups both included and excluded. Outgroups comprised four flavivirus of the Japanese encephalitis group. Phylogeny also included Bayesian analysis. The results indicated that the new SLEV isolate belongs to lineage III, being closely related to an Argentinean strain recovered from Culex sp. in 1979. It is concluded that there are at least 3 lineages of SLEV in Brazil. (AU)

• Processo FAPESP: 04/07819-6 - Analise molecular de virus dengue tipo 3 isolados de amostras clinicas
• Beneficiário: Cecília Luiza Simões dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Regular