About the Authors

Fabiana Spensieri

Contributed equally to this work with: Fabiana Spensieri, Emilio Siena

Current address: GSK Vaccines S.r.l., Siena, Italy

Affiliation Novartis Vaccines & Diagnostics S.r.l., Siena, Italy

Emilio Siena

Contributed equally to this work with: Fabiana Spensieri, Emilio Siena

Current address: GSK Vaccines S.r.l., Siena, Italy

Affiliation Novartis Vaccines & Diagnostics S.r.l., Siena, Italy

Erica Borgogni

Current address: GSK Vaccines S.r.l., Siena, Italy

Affiliation Novartis Vaccines & Diagnostics S.r.l., Siena, Italy

Luisanna Zedda

Current address: GSK Vaccines S.r.l., Siena, Italy

Affiliation Novartis Vaccines & Diagnostics S.r.l., Siena, Italy

Rocco Cantisani

Current address: Laboratory of Immunohematology, University Hospital, Pisa, Italy

Affiliation Novartis Vaccines & Diagnostics S.r.l., Siena, Italy

Nico Chiappini

Current address: GSK Vaccines S.r.l., Siena, Italy

Affiliation Novartis Vaccines & Diagnostics S.r.l., Siena, Italy

Francesca Schiavetti

Current address: GSK Vaccines S.r.l., Siena, Italy

Affiliation Novartis Vaccines & Diagnostics S.r.l., Siena, Italy

Domenico Rosa

Current address: GSK Vaccines S.r.l., Siena, Italy

Affiliation Novartis Vaccines & Diagnostics S.r.l., Siena, Italy

Flora Castellino

Current address: Center for Human Immunology, NHLBI, NIH, Bethesda, MD, United States of America

Affiliation Novartis Vaccines & Diagnostics S.r.l., Siena, Italy

Emanuele Montomoli

Affiliation Departement of Molecular and Developmental Medicine, University of Siena, & VisMederi S.r.l., Siena, Italy

Caroline L. Bodinham

Affiliation Surrey Clinical Research Center, University of Surrey, Guildford, United Kingdom

David J. Lewis

Affiliation Surrey Clinical Research Center, University of Surrey, Guildford, United Kingdom

Duccio Medini

Current address: GSK Vaccines S.r.l., Siena, Italy

Affiliation Novartis Vaccines & Diagnostics S.r.l., Siena, Italy

Sylvie Bertholet

sylvie.c.bertholet-girardin@gsk.com

Current address: GSK Vaccines S.r.l., Siena, Italy

Affiliation Novartis Vaccines & Diagnostics S.r.l., Siena, Italy

Giuseppe Del Giudice

Current address: GSK Vaccines S.r.l., Siena, Italy

Affiliation Novartis Vaccines & Diagnostics S.r.l., Siena, Italy

Competing Interests

FSp, ES, EB, LZ, RC, NC, FSc, DR, FC, DM, SB, and GDG were employee of Novartis Vaccines & Diagnostics S.r.l. at the time of the study. FSp, ES, EB, LZ, NC, FSc, DR, DM, SB, and GDG are now employee of GSK Vaccines S.r.l. This does not alter the authors' adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: F Spensieri FC EM. Performed the experiments: F Spensieri EB LZ F Schiavetti RC NC DR. Analyzed the data: F Spensieri EB ES DM. Contributed reagents/materials/analysis tools: EM. Wrote the paper: F Spensieri ES SB DL GDG. Designed and conducted the clinical trial: DL CLB.