About the Authors

Elena S Lysenko

Affiliations Department of Microbiology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, United States of America , Department of Pediatrics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, United States of America

Thomas B Clarke

Affiliation Department of Biological Sciences, University of Warwick, Coventry, United Kingdom

Mikhail Shchepetov

Affiliations Department of Microbiology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, United States of America , Department of Pediatrics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, United States of America

Adam J Ratner

¤ Current address: Departments of Pediatrics and Microbiology, Columbia University, New York, New York, United States of America

Affiliation Department of Microbiology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, United States of America

David I Roper

Affiliation Department of Biological Sciences, University of Warwick, Coventry, United Kingdom

Christopher G Dowson

Affiliation Department of Biological Sciences, University of Warwick, Coventry, United Kingdom

Jeffrey N Weiser

To whom correspondence should be addressed. E-mail: weiser@mail.med.upenn.edu

Affiliations Department of Microbiology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, United States of America , Department of Pediatrics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

ESL, AJR, and JNW conceived and designed the experiments. ESL, TBC, and MS performed the experiments. ESL and JNW analyzed the data. TBC, DIR, and CGD contributed reagents/materials/analysis tools. JNW wrote the paper.