About the Authors

Cyril Jean-Marie Martel

Affiliation Department of Veterinary Disease Biology, Faculty of Life Sciences, University of Copenhagen, Copenhagen, Denmark

Else Marie Agger

Affiliation Department of Infectious Disease Immunology, Statens Serum Institut, Copenhagen, Denmark

Julie Juul Poulsen

Affiliation Department of Veterinary Disease Biology, Faculty of Life Sciences, University of Copenhagen, Copenhagen, Denmark

Trine Hammer Jensen

Affiliation Department of Veterinary Disease Biology, Faculty of Life Sciences, University of Copenhagen, Copenhagen, Denmark

Lars Andresen

Affiliation Department of Veterinary Disease Biology, Faculty of Life Sciences, University of Copenhagen, Copenhagen, Denmark

Dennis Christensen

Affiliation Department of Infectious Disease Immunology, Statens Serum Institut, Copenhagen, Denmark

Lars Peter Nielsen

Affiliation National Influenza Laboratory, Statens Serum Institut, Copenhagen, Denmark

Merete Blixenkrone-Møller

Affiliation Department of Veterinary Disease Biology, Faculty of Life Sciences, University of Copenhagen, Copenhagen, Denmark

Peter Andersen

PA@ssi.dk (PA); bas@life.ku.dk (BA)

Affiliation Department of Infectious Disease Immunology, Statens Serum Institut, Copenhagen, Denmark

Bent Aasted

PA@ssi.dk (PA); bas@life.ku.dk (BA)

Affiliation Department of Veterinary Disease Biology, Faculty of Life Sciences, University of Copenhagen, Copenhagen, Denmark

Competing Interests

CJM is employed by Scienslation. EMA, DC, LPN and PA are employed by the Statens Serum Institute. This does not alter the authors' adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: CJM EMA DC LPN PA BA MB-M. Performed the experiments: CJM JJP THJ LA BA. Analyzed the data: CJM JJP LA BA MB-M. Contributed reagents/materials/analysis tools: DC LA LPN. Wrote the paper: CJM EMA PA BA.