1. Section for Zoonotic Ecology and Epidemiology, School of Pure and Applied Natural Sciences, University of Kalmar, Kalmar, Sweden.
2. Aquatic Biology and Chemistry Group, Kristianstad University, Kristianstad, Sweden.
3. INRA, CR 346, Saint Genès Champanelle, France.
4. Section of Infectious Diseases, Department of Medical Sciences, Uppsala University Hospital, Uppsala, Sweden.
5. Department of Contaminant Research, Swedish Museum of Natural History, Stockholm, Sweden.
6. Department of Zoology, University of Gothenburg, Gothenburg, Sweden.