About the Authors

Maureen Craig

Affiliation Department of Microbiology, University of Illinois, Urbana, Illinois, United States of America

James M. Slauch

slauch@illinois.edu

Affiliations Department of Microbiology, University of Illinois, Urbana, Illinois, United States of America, College of Medicine, University of Illinois, Urbana, Illinois, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MC JMS. Performed the experiments: MC. Analyzed the data: MC JMS. Wrote the paper: MC JMS.