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Introduction of a novel influenza virus into the human population leads to the occurrence of pandemic events, such as the one caused by pandemic influenza A (H1N1) 2009 virus. The severity of infections caused by this virus in young adults was greater than that observed in patients with seasonal influenza. Fatal cases have been associated with an abnormal innate, proinflammatory immune response. A...
To determine the contribution of influenza and respiratory syncytial virus (RSV) as the cause of lower respiratory tract infection (LRTI) associated hospitalizations during the first year of the influenza A(H1N1) 2009 pandemic and to assess the severity of illness during the second pandemic wave.Patients admitted with LRTI from April 2009 through March 2010 were assessed for the presence of influenza...
We analyzed 2378 respiratory samples of children <5 years of age admitted during a 7-year period in order to determine the contribution of seasonal influenza as a cause of hospitalizations, as well as the impact of the inclusion of influenza vaccine in the childhood immunization program. The presence of influenza virus was demonstrated in 106 (4.4%) samples. The proportion of influenza hospitalizations...
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