1. Virus Research and Development Laboratory, Department of Microbiological Diagnostics and Virology, Statens Serum Institut, Copenhagen, Denmark.
2. Biomedical Department, Virology Unit, Institute of Tropical Medicine, Antwerp, Belgium.
3. Department of Experimental Medical Science, Lund University, Lund, Sweden.
4. Department of Infectious Diseases and Rheumatology, Copenhagen University Hospital, Copenhagen, Denmark.
5. Department of Infectious Diseases, Copenhagen University Hospital, Hvidovre, Denmark.
6. Bandim Health Project, Indepth Network, Bissau, Guinea-Bissau.
7. Department of Infectious Diseases, Aarhus University Hospital, Aarhus, Denmark.
8. Department of Clinical Immunology, Aarhus University Hospital, Aarhus, Denmark.
9. National Public Health Laboratory, Bissau, Guinea-Bissau.
10. Infectious Disease Research Unit, Clinical Institute, University of Southern Denmark, Odense, Denmark.