[1] Univ Bern, Inst Infect Dis, Friedbuhlstr 51, CH-3010 Bern, Switzerland
[2] Univ Bern, Grad Sch Cellular & Biomed Sci, CH-3010 Bern, Switzerland
[3] Lab Med Zentrum Dr Risch, Dept Med Microbiol, Bern, Switzerland
[4] A Manzoni Hosp, Microbiol Lab, Lecce, Italy