Márió Gajdács1,2, Edit Urbán3. 1. Institute of Clinical Microbiology, Faculty of Medicine, University of Szeged , Semmelweis Utca 6, Szeged, 6725 , Hungary. 2. Department of Pharmacodynamics and Biopharmacy, Faculty of Pharmacy, University of Szeged , Eötvös Utca 6, Szeged, 6720 , Hungary. 3. Department of Public Health, Faculty of Medicine, University of Szeged , Dóm Tér 10, Szeged, 6720 , Hungary.