Tamara Tuuminen1, Christer Haggqvist2, Arja Uusitalo3. 1. Clinical Microbiology Laboratory, Mikkeli Central Hospital, Mikkeli, Finland; University of Helsinki, Medicum, Department of Bacteriology and Immunology, Helsinki, Finland. Electronic address: tuuminen@gmail.com. 2. Vaasa Central Hospital, Vaasa, Finland. 3. Helsinki University Hospital, Helsinki, Finland.