title: The Authors Reply.
authors.affiliation: Department of Microbiological Diagnostics and Virology, Statens Serum Institut, Copenhagen, Denmark.
authors.forename: Alex Christian Yde
authors.initials: AC
authors.lastname: Nielsen
authors.affiliation: Department of Epidemiology Research, Statens Serum Institut, Copenhagen, Denmark.
authors.forename: Nete Munk
authors.initials: NM
authors.lastname: Nielsen
authors.affiliation: Department of Microbiological Diagnostics and Virology, Statens Serum Institut, Copenhagen, Denmark.
authors.forename: Sofie Elisabeth
authors.initials: SE
authors.lastname: Midgley
authors.affiliation: Department of Clinical Microbiology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.
authors.forename: Claus Bohn
authors.initials: CB
authors.lastname: Christiansen
authors.affiliation: 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.
authors.forename: Thea Kølsen
authors.initials: TK
authors.lastname: Fischer