Estudio de la epidemia de gripe A nH1N1 de 2009-2010: Síntomas guía en Atención Primaria. Comparación clínica con los casos hospitalarios

objectives: to analyze the prediction's capacity of clinical symptoms to diagnose nh1n1 influenza in outpatients who were chosen by aragon's sentinel surveillance network. to compare outpatients with hospitalized cases during influenza a virus pandemic (2009-2010). methods: retrospective study of a randomized group of patients with symptoms of influenza who had laboratory-confirmation by pcr-rt and of all patients admitted to the reference hospital of aragon. comparison of epidemiological and clinical characteristics in outpatients and between outpatients and hospital cases. results: there were no clinical differences between the laboratory-confirmed by pcr-rt cases and the other outpatients, so it was not possible to find defining symptoms of infection. hospitalized patients were younger, with higher percentage of underlying disease and comorbidity. conclusions: the epidemic of influenza a behaved as a benign disease, symptoms were similar to seasonal influenza. the clinical finding of having influenza symptoms in a high incidence week (weeks 43-48) was moderately predictive of influenza a infection.