About the Authors

Martin Schulze

Affiliation Robert Koch-Institut, Fachgebiet 17 Influenza/Respiratorische Viren, Berlin, Germany

Andreas Nitsche

Affiliation Robert Koch-Institut, Zentrum für Biologische Sicherheit 1, Berlin, Germany

Brunhilde Schweiger

Affiliation Robert Koch-Institut, Fachgebiet 17 Influenza/Respiratorische Viren, Berlin, Germany

Barbara Biere

biereb@rki.de

Affiliation Robert Koch-Institut, Fachgebiet 17 Influenza/Respiratorische Viren, Berlin, Germany

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: BB. Performed the experiments: MS. Analyzed the data: BB. Contributed reagents/materials/analysis tools: AN BS. Wrote the paper: BB.