About the Authors

Kriengsak Limkittikul

Affiliation Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand

Jeremy Brett

Affiliation sanofi-aventis Singapore Pte Ltd, Singapore

Maïna L'Azou

Maina.Lazou@sanofipasteur.com

Affiliation Global Epidemiology Department, Sanofi Pasteur, France

Competing Interests

KL declares no conflicts of interest. JB is employed by sanofi-aventis Singapore Pte Ltd and ML is employed by Sanofi Pasteur. This does not alter our adherence to all PLoS policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: JB KL ML. Performed the experiments: JB KL ML. Analyzed the data: JB KL ML. Contributed reagents/materials/analysis tools: JB KL ML. Wrote the paper: JB KL ML.