RESUMO
Compared to previous years, seasonal influenza activity commenced early in São Paulo State, Brazil, Southern hemisphere during the 2016 year. In order to investigate the genetic pattern of influenza A(H1N1)pdm09 in the State of Sao Paulo a total of 479 respiratory samples, collected in January by Sentinel Surveillance Units, were screened by real-time RT-PCR. A total of 6 Influenza viruses A(H1N1)pdm09 presenting ct values ≤ 30 were sequenced following phylogenetic analysis. The present study identified the circulation of the new 6B.1 subgroup (A/Sao Paulo/10-118/2016 and A/Sao Paulo/3032/2016). In addition, influenza A(H1N1)pdm09 group 6B has also been identified during January in the State of Sao Paulo. Despite amino acid changes and changes in potential glycosylation motifs, 6B.1 viruses were well inhibited by the reference ferret antiserum against A/California/07/2009 virus, the A(H1N1)pdm09 component of the vaccine for the 2016 influenza season.
Assuntos
Vírus da Influenza A Subtipo H1N1/genética , Influenza Humana/epidemiologia , Influenza Humana/virologia , Análise de Sequência de DNA , Brasil/epidemiologia , Hemaglutininas , Humanos , Filogenia , Estações do AnoRESUMO
In São Paulo the mumps virus (MuV) outbreaks have been increasing from In São Paulo the mumps virus (MuV) outbreaks have been increasing from 2011 to nowadays. MuV epidemiological surveillance has been improving by using the polymerase chain reaction in real time (rRT-PCR) in addition to the specific IgM antibody (IgM-Ab) detection; in some cases,genome sequencing studies were performed. Increased virus transmission and recent outbreakshave raised interest on MuV genotyping, as a means to understand the transmission pathways andto identify the vaccine-associated cases. From January 2011 to August 2016, MuV infection was analyzed at Institute Adolfo Lutz. A total of 232 (77.33 %) throat wash samples showed positivity to mumps genome, and 68 (22.66 %) were negative when analyzed by rRT-PCR. Among 15 samples for molecular analysis, 10 serum samples from respective patients were also available for detecting anti-MuV IgM-Ab; and from these, four (40%) samples were seropositive. Vaccination statuswas available only for patients from Cedral and Araraquara. Phylogenetic analysis revealed the circulation of the following mumps virus genotypes in the investigated periods: 2011(M), 2012, and 2013 (K); 2014 (N); 2015 (G, K, and N); 2016 (G). Knowledge on MuV molecular epidemiology in São Paulo-Brazil could contribute to the surveillance and epidemiological program in Brazil, and globally as well.
No estado de São Paulo têm ocorrido surtos de caxumba desde 2011. O diagnóstico laboratorialtem sido realizado no Instituto Adolfo Lutz utilizando-se a técnica de identificação de material genético viral por meio de reação de cadeia de polimerase-em tempo real (rRT-PCR) e peladetecção de anticorpos IgM (Ac-IgM) específicos circulantes. Os recentes surtos de caxumbatêm aumentado o interesse em investigar os genótipos dos vírus prevalentes para identificaros casos associadas à vacina. De janeiro de 2011 a agosto de 2016, 300 amostras de lavadosda orofaringe coletadas de pacientes suspeitos de infecção foram analisadas. O material genéticoviral específico foi detectado em 232 (77,33 %) amostras e 68 (22,66 %) foram negativas.Das 10 amostras analisadas pelo teste sorológico, quatro (40 %) demonstraram positividadepara Ac-IgM específicos anti-vírus da caxumba e seis foram negativas. Somente os municípios Cedral e Araraquara forneceram os dados referentes à vacinação. Análise filogenética mostroua circulação dos seguintes genótipos do vírus da caxumba no período investigado: 2011 (M),2012 e 2013 (K); 2014 (N); 2015 (GKN); 2016 (G). A vigilância virológica é mundialmente imprescindível, para identificar a diversidade e a distribuição dos diferentes genótipos, com vistasà composição de vacinas específicas.
Assuntos
Epidemiologia Molecular , Genótipo , Saúde Pública , Surtos de Doenças , Vírus da CaxumbaRESUMO
In São Paulo the mumps virus (MuV) outbreaks have been increasing from 2011 to nowadays. MuV epidemiological surveillance has been improving by using the polymerase chain reaction in real time (rRT-PCR) in addition to the specific IgM antibody (IgM-Ab) detection; in some cases, genome sequencing studies were performed. Increased virus transmission and recent outbreaks have raised interest on MuV genotyping, as a means to understand the transmission pathways and to identify the vaccine-associated cases. From January 2011 to August 2016, MuV infection was analyzed at Institute Adolfo Lutz. A total of 232 (77.33 %) throat wash samples showed positivity to mumps genome, and 68 (22.66 %) were negative when analyzed by rRT-PCR. Among 15 samples for molecular analysis, 10 serum samples from respective patients were also available for detecting anti-MuV IgM-Ab; and from these, four (40%) samples were seropositive. Vaccination status was available only for patients from Cedral and Araraquara. Phylogenetic analysis revealed the circulation of the following mumps virus genotypes in the investigated periods: 2011(M), 2012, and 2013 (K); 2014 (N); 2015 (G, K, and N); 2016 (G). Knowledge on MuV molecular epidemiology in São Paulo-Brazil could contribute to the surveillance and epidemiological program in Brazil, and globally as well.
No estado de São Paulo têm ocorrido surtos de caxumba desde 2011. O diagnóstico laboratorial tem sido realizado no Instituto Adolfo Lutz utilizando-se a técnica de identificação de material genético viral por meio de reação de cadeia de polimerase-em tempo real (rRT-PCR) e pela detecção de anticorpos IgM (Ac-IgM) específicos circulantes. Os recentes surtos de caxumba têm aumentado o interesse em investigar os genótipos dos vírus prevalentes para identificar os casos associadas à vacina. De janeiro de 2011 a agosto de 2016, 300 amostras de lavados da orofaringe coletadas de pacientes suspeitos de infecção foram analisadas. O material genético viral específico foi detectado em 232 (77,33 %) amostras e 68 (22,66 %) foram negativas. Das 10 amostras analisadas pelo teste sorológico, quatro (40 %) demonstraram positividade para Ac-IgM específicos anti-vírus da caxumba e seis foram negativas. Somente os municípios Cedral e Araraquara forneceram os dados referentes à vacinação. Análise filogenética mostrou a circulação dos seguintes genótipos do vírus da caxumba no período investigado: 2011 (M), 2012 e 2013 (K); 2014 (N); 2015 (GKN); 2016 (G). A vigilância virológica é mundialmente imprescindível, para identificar a diversidade e a distribuição dos diferentes genótipos, com vistas à composição de vacinas específicas.