About the Authors

Jeroen L. A. Pennings

Jeroen.Pennings@rivm.nl

Affiliation Laboratory for Health Protection Research (GBO), National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands

Tjeerd G. Kimman

Affiliations Laboratory for Health Protection Research (GBO), National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands, Central Veterinary Institute, Lelystad, The Netherlands

Riny Janssen

Affiliation Laboratory for Health Protection Research (GBO), National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RJ JP. Analyzed the data: JP. Wrote the paper: TK RJ JP.