A nosocomial outbreak of influenza during a period without influenza epidemic activity
J.P. Horcajada, T. Pumarola, J.A. Martínez, G. Tapias, J.M. Bayas, M. de la Prada, F. García, C. Codina, J.M. Gatell, M.T. Jiménez de Anta
European Respiratory Journal Feb 2003, 21 (2) 303-307; DOI: 10.1183/09031936.03.00040503