1. Section for Zoonotic Ecology and Epidemiology, University of Kalmar, SE-391 82 Kalmar, Sweden
2. Department of Animal Ecology, Lund University, SE-223 62 Lund, Sweden
3. Department of Clinical Physiology, Kalmar County Hospital, SE-392 85 Kalmar, Sweden
4. Section of Infectious Diseases, Department of Medical Sciences, Uppsala University Hospital, SE-751 85 Uppsala, Sweden