作者单位:Laboratory of Clinical Bacteriology, Parasitology, Zoonoses and Geographical Medicine, School of Medicine, University of Crete, 71409 Heraklion, Greece[1]Department of Biology, University of Crete, P.O. Box 2208, Heraklion GR 71409, Greece[2]University of California, Berkeley, CA, USA[3]Univ Crete, Sch Med, Lab Clin Bacteriol Parasitol Zoonoses and Geog Med, Iraklion 71409, Greece[4]