About the Authors

Cornelia Blaser

Affiliation Institute for Infectious Diseases, University of Bern, Bern, Switzerland

Matthias Wittwer

Affiliation Spiez Laboratory, Spiez, Switzerland

Denis Grandgirard

Affiliation Institute for Infectious Diseases, University of Bern, Bern, Switzerland

Stephen L. Leib

stephen.leib@ifik.unibe.ch

Affiliation Institute for Infectious Diseases, University of Bern, Bern, Switzerland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: SLL MW DG. Performed the experiments: CB. Analyzed the data: CB MW DG SLL. Wrote the paper: CB MW DG SLL.