About the Authors

Joël Mossong
Microbiology Unit, Laboratoire National de Santé, Luxembourg, Luxembourg

Joël Mossong
Centre de Recherche Public Santé, Luxembourg, Luxembourg

Niel Hens
Center for Statistics, Hasselt University, Diepenbeek, Belgium

Mark Jit, W. John Edmunds
Modelling and Economics Unit, Health Protection Agency Centre for Infections, London, United Kingdom

Philippe Beutels
Unit Health Economic and Modeling Infectious Diseases, Center for the Evaluation of Vaccination, Vaccine & Infectious Disease Institute, University of Antwerp, Antwerp, Belgium

Kari Auranen
Department of Vaccines, National Public Health Institute KTL, Helsinki, Finland

Rafael Mikolajczyk
School of Public Health, University of Bielefeld, Bielefeld, Germany

Marco Massari, Stefania Salmaso
Istituto Superiore di Sanità, Rome, Italy

Gianpaolo Scalia Tomba
Department of Mathematics, University of Rome Tor Vergata, Rome, Italy

Jacco Wallinga, Janneke Heijne
Centre for Infectious Disease Control Netherlands, National Institute for Public Health and the Environment, Bilthoven, The Netherlands

Malgorzata Sadkowska-Todys, Magdalena Rosinska
National Institute of Hygiene, Warsaw, Poland

Corresponding Author


Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

JM, NH, MJ, JW, and WJE drafted the manuscript in consultation with all the other authors; the original idea and contact diary were conceived by WJE. JM conducted a pilot study on an adapted diary, and coordinated overall survey design and data collection. JM, MJ, PB, KA, RM, MM, GST, JW, JH, MST, and MR conducted the surveys in their respective countries. NH conducted the data mining and surface smoothing. JW and JH conducted the epidemic modelling. All authors approved the final manuscript.