1. 1Department of Microbiology, Faculty of Science, Eötvös Loránd University, Pázmány Péter stny., 1/C, H-1117 Budapest, Hungary
2. 2Department of Water Hygiene, National Public Health Center, Albert Flórián út 2-6. H-1097 Budapest, Hungary
3. 3Leibniz Institute DSMZ-German Collection of Microorganisms and Cell Cultures, Inhoffenstrasse 7B, D-38124, Braunschweig, Germany