About the Authors

Mari Strengell

mari.strengell@thl.fi

Affiliation Viral Infections Unit, Department of Vaccines and Immune Protection, National Institute for Health and Welfare, Helsinki, Finland

Niina Ikonen

Affiliation Viral Infections Unit, Department of Vaccines and Immune Protection, National Institute for Health and Welfare, Helsinki, Finland

Thedi Ziegler

Affiliation Viral Infections Unit, Department of Vaccines and Immune Protection, National Institute for Health and Welfare, Helsinki, Finland

Ilkka Julkunen

Affiliation Viral Infections Unit, Department of Vaccines and Immune Protection, National Institute for Health and Welfare, Helsinki, Finland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MS NI TZ IJ. Performed the experiments: MS NI. Analyzed the data: MS NI TZ IJ. Contributed reagents/materials/analysis tools: MS NI TZ IJ. Wrote the paper: MS NI TZ IJ.