About the Authors

Song Ok Kang

Current address: Department of Physiology, School of Medicine, Southern Illinois University, Carbondale, Illinois, United States of America

Affiliation Department of Microbiology, Southern Illinois University Carbondale, Carbondale, Illinois, United States of America

Jordan O. Wright

Affiliation Department of Microbiology, Southern Illinois University Carbondale, Carbondale, Illinois, United States of America

Rafael A. Tesorero

Affiliation Department of Microbiology, Southern Illinois University Carbondale, Carbondale, Illinois, United States of America

Hyunwoo Lee

Affiliation Center for Pharmaceutical Biotechnology, University of Illinois, Chicago, Illinois, United States of America

Bernard Beall

Affiliation Streptococcus Laboratory, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America

Kyu Hong Cho

cho@micro.siu.edu

Affiliation Department of Microbiology, Southern Illinois University Carbondale, Carbondale, Illinois, United States of America

Competing Interests

Co-author Bernard Beall is a PLoS ONE Editorial Board member. This does not alter the authors' adherence to all the PLoS ONE policies on sharing data and materials..

Author Contributions

Conceived and designed the experiments: KC SK. Performed the experiments: KC SK RT JW HL. Analyzed the data: KC SK RT JW BB. Contributed reagents/materials/analysis tools: KC BB. Wrote the paper: KC BB.