About the Authors

Ritva K. Syrjänen

ritva.syrjanen@thl.fi

Affiliation Department of Vaccination and Immune Protection, National Institute for Health and Welfare, Tampere, Finland

Jukka Jokinen

Affiliation Department of Vaccination and Immune Protection, National Institute for Health and Welfare, Helsinki, Finland

Thedi Ziegler

Current address: Department of Infectious Disease Surveillance and Control, National Institute for Health and Welfare, Helsinki, Finland

Affiliation Department of Vaccination and Immune Protection, National Institute for Health and Welfare, Helsinki, Finland

Jonas Sundman

Affiliation Department of Vaccination and Immune Protection, National Institute for Health and Welfare, Helsinki, Finland

Mika Lahdenkari

Affiliation Department of Vaccination and Immune Protection, National Institute for Health and Welfare, Helsinki, Finland

Ilkka Julkunen

Current address: Department of Infectious Disease Surveillance and Control, National Institute for Health and Welfare, Helsinki, Finland; Department of Virology, University of Turku, Turku, Finland

Affiliation Department of Vaccination and Immune Protection, National Institute for Health and Welfare, Helsinki, Finland

Terhi M. Kilpi

Current address: Division of Health Protection, National Institute for Health and Welfare, Helsinki, Finland

Affiliation Department of Vaccination and Immune Protection, National Institute for Health and Welfare, Helsinki, Finland

Competing Interests

THL has received research support from GlaxoSmithKline Biologicals and Pfizer for a pneumococcal vaccine trial and other pneumococcal studies, not related to this study. T. Kilpi has acted as a principal investigator and R. Syrjänen, J. Jokinen and J. Sundman have acted as co-investigators in these studies but not received any personal payments. J. Jokinen is a member of Independent Data Monitoring Committee for Dengue vaccine trial of Sanofi Pasteur. None of the authors have any financial interest in the vaccines or manufacturers discussed in this article apart from those disclosed. This does not alter the authors' adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: JJ TMK RKS IJ TZ. Performed the experiments: RKS JS. Analyzed the data: JJ RKS ML JS. Contributed reagents/materials/analysis tools: JJ JS ML. Wrote the paper: RMS TMK JJ IJ TZ ML JS.