1. Center for Ecology and Evolution in Microbial Model Systems, Linnaeus University, SE-391 82 Kalmar, Sweden
2. Department of Biology, Lund University, Ecology Building, 223 62 Lund, Sweden
3. Department of Infectious Disease, J. Craig Venter Institute, Rockville, MD, USA
4. Department of Virology, Erasmus Medical Center, Rotterdam, The Netherlands
5. Department of Zoology, University of Oxford, Oxford OX1 3SY, UK
6. Department of Medical Biochemistry and Microbiology, Zoonosis Science Center, Uppsala University, Uppsala, Sweden