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oai:repisalud.isciii.es:20.500.12105/261362025-12-18T12:52:54Zcom_20.500.12105_2052com_20.500.12105_2051col_20.500.12105_19608col_20.500.12105_19609

00925njm 22002777a 4500 dc Ledesma, Juan author Pozo Sanchez, Francisco author Reina, Gabriel author Blasco, Miriam author Rodríguez, Guadalupe author Montes, Milagrosa author López-Miragaya, Isabel author Salvador, Carmen author Reina, Jordi author Ortíz de Lejarazu, Raúl author Egido, Pilar author López Barba, José author Delgado-Sanz, Concepcion author Cuevas, Maria Teresa author Casas Flecha, Inmaculada author Spanish Influenza Surveillance System (SISS) author Larrauri, Amparo author Jimenez-Jorge, Silvia author 2012-01 Background: Genetic diversity of influenza A(H1N1)2009 viruses has been reported since the pandemic virus emerged in April 2009. Different genetic clades have been identified and defined based on amino acid substitutions found in the haemagglutinin (HA) protein sequences. In Spain, circulating influenza viruses are monitored each season by the regional laboratories enrolled in the Spanish Influenza Surveillance System (SISS). The analysis of the HA gene sequence helps to detect the genetic diversity and viral evolution. Objectives: To perform an analysis of the genetic diversity of influenza A(H1N1)2009 viruses circulating in Spain during the season 2010-2011 based on analysis of the HA sequence gene. Study design: Phylogenetic analysis based on the HA1 subunit of the haemagglutinin gene was carried out on 220 influenza A(H1N1)2009 viruses circulating during the season 2010-2011. Results: Six different genetic groups were identified among circulating A(H1N1)2009 viruses, five of them were previously reported during season 2010-2011. A new group, characterized by E172K and K308E changes and a proline at position 83, was observed in 12.27% of the Spanish viruses. Conclusion: Co-circulation of six different genetic groups of influenza A(H1N1)2009 viruses was identified in Spain during the season 2010-2011. Nevertheless, at this stage, none of the groups identified to date have resulted in significant antigenic changes according to data collected by World Health Organization Collaborating Centres for influenza surveillance. Ledesma J, Pozo F, Reina G, Blasco M, Rodríguez G, Montes M, López-Miragaya I, Salvador C, Reina J, Ortíz de Lejarazu R, Egido P, López Barba J, Delgado C, Cuevas MT, Casas I; Spanish Influenza Surveillance System (SISS). Genetic diversity of influenza A(H1N1)2009 virus circulating during the season 2010-2011 in Spain. J Clin Virol. 2012 Jan;53(1):16-21. 10.1016/j.jcv.2011.09.032 1873-5967 1386-6532 Journal of clinical virology: the official publication of the Pan American Society for Clinical Virology 22071031 https://hdl.handle.net/20.500.12105/26136 Influenza A(H1N1)2009 Haemagglutinin Phylogeny Genetic diversity of influenza A(H1N1)2009 virus circulating during the season 2010-2011 in Spain