About the Authors

Michael A. Bachman

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

Virginia L. Miller

Affiliations Department of Genetics, The University of North Carolina, Chapel Hill, North Carolina, United States of America, Department of Microbiology and Immunology, The University of North Carolina, Chapel Hill, North Carolina, United States of America

Jeffrey N. Weiser

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

Conceived and designed the experiments: MAB JNW. Performed the experiments: MAB. Analyzed the data: MAB. Contributed reagents/materials/analysis tools: VM. Wrote the paper: MAB VM JNW.