Nosocomial acquisition of influenza is associated with significant morbidity and mortality: Results of a prospective observational study oleh L.B. Snell, J.P. Vink, N.Q. Verlander, S. Miah, A. Lackenby, D. Williams, H. Mitchell, C. Beviz, M. Kabia, E. Cunningham, R. Batra, J.D. Edgeworth, M. Zambon, G. Nebbia