Microbiological investigation of a hospital outbreak of invasive group A streptococcal disease in Krakow, Poland. - Strus, M.; Drzewiecki, A.; Chmielarczyk, A.; Tomusiak, A.; Romanek, P.; Kosowski, K.; Kochan, P.; van der Linden, M.; Lütticken, R.; Heczko, P. B. (Clinical Microbiology & Infection, 2010)