![A nosocomial outbreak of influenza during a period without influenza epidemic activity]()
A nosocomial outbreak of influenza during a period without influenza epidemic activityHorcajada, J.P.; Pumarola, T.; Martinez, J.A.; Tapias, G.; Bayas, J.M.; de la Prada, M.; Garcia, F.; Codina, C.; Gatell, J.M.; Jimenez de Anta, M.T. · European Respiratory Journal · 2003