1 Department of Microbiological Diagnostics and Virology, Statens Serum Institut, Copenhagen, Denmark.
2 Department of Epidemiology Research, Statens Serum Institut, Copenhagen, Denmark.
3 Department of Clinical Microbiology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.
4 Department of Microbiological Diagnostics and Virology, Statens Serum Institut, Copenhagen, Denmark Global Health Center and Department of Infectious Diseases, University of Southern Denmark, Odense, Denmark.