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Title: Impact of influenza in the post-pandemic phase: Clinical features in hospitalized patients with influenza A (H1N1) pdm09 and H3N2 viruses, during 2013 in Santa Fe, Argentina
Authors: Kusznierz, Gabriela F. 
Carolina, Cudós 
Manuel, Rudi Juan 
Sergio, Lejona 
Lucila, Ortellao 
Julio, Befani 
Mirta, Villani 
Pedro, Morana 
Graciana, Morera 
Andrea, Uboldi 
Zerbini, Elsa V. 
Keywords: influenza A (H1N1) pdm09;fase post pandemia;Subtipo H3N2 del Virus de la Influenza A
Issue Date: 2017
Journal: Journal of medical virology 
It is important to characterize the clinical and epidemiological pattern of the influenza A (H1N1) pdm09 virus and compare it with influenza A (H3N2) virus, as surveyed in just a few studies, in order to contribute to the implementation and strengthening of influenza control and prevention strategies. The aims in this study were to describe influenza clinical and epidemiological characteristics in hospitalized patients, caused by influenza A (H1N1)pdm09 and influenza A (H3N2) viruses during 2013, in Santa Fe, Argentina. A retrospective study was conducted over 2013 among hospitalized patients with laboratory-confirmed influenza diagnosis. In contrast to patients with influenza A (H3N2) (20.5%), a higher proportion of hospitalizations associated with influenza H1N1pdm were reported among adults aged 35-65 years (42.8%). Of all patients, 73.6% had an underlying medical condition. Hospitalized patients with H1N1pdm were subject to 2.6 (95%CI, 1.0-6.8) times higher risk of severity, than those hospitalized with influenza A (H3N2). This results demonstrate the impact in the post-pandemic era of H1N1pdm virus, with increased risk of severe disease, in relation to H3N2 virus, both viruses co-circulating during 2013.
DOI: 10.1002/jmv.24758
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