About the Authors

Sandra Dudareva

DudarevaS@rki.de

Affiliations European Programme for Intervention Epidemiology Training (EPIET), European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden, Postgraduate Training for Applied Epidemiology (PAE, German FETP), Robert Koch-Institute, Berlin, Germany

Brunhilde Schweiger

Affiliation National Reference Centre for Influenza, Department of Infectious Diseases, Robert Koch Institute, Berlin, Germany

Michel Thamm

Affiliation Department of Epidemiology and Health Reporting, Robert Koch Institute, Berlin, Germany

Michael Höhle

Affiliation Department for Infectious Disease Epidemiology, Robert Koch Institute, Berlin, Germany

Klaus Stark

Affiliation Department for Infectious Disease Epidemiology, Robert Koch Institute, Berlin, Germany

Gérard Krause

Affiliation Department for Infectious Disease Epidemiology, Robert Koch Institute, Berlin, Germany

Silke Buda

Affiliation Department for Infectious Disease Epidemiology, Robert Koch Institute, Berlin, Germany

Walter Haas

Affiliation Department for Infectious Disease Epidemiology, Robert Koch Institute, Berlin, Germany

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Analyzed the data: SD MH WH. Wrote the paper: SD MH WH. Conceived and designed the study: SD KS GK SB WH. Organized sera collection and demographical data: MT. Developed and performed the laboratory procedures: BS.