1. Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University , Universitetsplatsen 1, Kalmar SE-39231, Sweden
2. Department of Virology, Erasmus Medical Centre , Rotterdam, The Netherlands
3. J. Craig Venter Institute , Rockville, MD, USA
4. Department of Zoology, University of Oxford , South Parks Road, Oxford OX1 3SY, UK
5. Department of Pathobiology and Population Sciences, The Royal Veterinary College , London AL9 7TA, UK
6. Section of Infectious Diseases, Department of Medical Sciences, Uppsala University , Uppsala SE751 85, Sweden