About the Authors
Research Center, Novartis Vaccines and Diagnostics s.r.l., Siena, Italy
Department of Evolutionary Biology, University of Siena, Siena, Italy
Paid employment: All authors (except F. Giusti) are paid by Novartis Vaccines and Diagnostics s.r.l.
Conceived and designed the experiments: MH BB IF. Performed the experiments: MH FG BB IF. Analyzed the data: MH FG BB VM AC RR MB IF. Contributed reagents/materials/analysis tools: MH FG BB MB IF. Wrote the paper: MH BB MB IF. Support for the study: AC RR.