1. Public Health Agency of Sweden, Solna, Sweden
2. Center for Infectious Medicine, Department of Medicine Huddinge, Karolinska Institutet, Stockholm, Sweden
3. National Veterinary Institute, Uppsala, Sweden
4. Swedish Defence Research Agency, Umeå, Sweden
5. Sunderbyn Hospital, Luleå, Sweden
6. Department of Clinical Microbiology, Infectious Diseases, Umeå University, Umeå, Sweden