[Pandemic influenza A (H1N1) 2009: epidemiology, clinical features and differences with seasonal influenza in Chile].

Unlabelled: Pandemic influenza A (H1N1) 2009 raised questions regarding differences with seasonal influenza.

Objectives: To describe the clinical features of pandemic influenza and compare them to seasonal influenza. PATIENTS Y METHODS: A descriptive study that compared hospitalized adults was done between patients with confirmed pandemic influenza in the Hospital Clínico Universidad Católica in Santiago, Chile, from May to July 2009 and 95 confirmed historic cases of seasonal influenza.