1. Thetis, Food and Environmental Laboratory, Tórshavn, Faroe Islands.
2. Medical Faculty, University of Iceland, Reykjavík, Iceland.
3. Department of Clinical Microbiology, Landspitali University Hospital, Reykjavik, Iceland.
4. Infectious Diseases Division, Department of Medicine, National Hospital of the Faroe Islands, Tórshavn, Faroe Islands.
5. Centre of Health Research, University of the Faroe Islands, Tórshavn, Faroe Islands.
6. Infectious Diseases Research Unit, Odense University Hospital and University of Southern Denmark, Odense, Denmark.
7. Centre for Health Security and Communicable Disease Control, Reykjavík, Iceland.