About the Authors

Kathryn L. Kellar

Affiliation Division of Scientific Resources, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America

Jennifer Gehrke

Affiliation Division of Tuberculosis Elimination, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America

Stephen E. Weis

Affiliations Department of Medicine, University of North Texas Health Science Center, Fort Worth, Texas, United States of America, Tarrant County Public Health Department, Fort Worth, Texas, United States of America

Aida Mahmutovic-Mayhew

Affiliations Division of Scientific Resources, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America, Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee, United States of America

Blachy Davila

Affiliation Division of Tuberculosis Elimination, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America

Margan J. Zajdowicz

Current address: Pediatric Infectious Diseases, National Naval Medical Center, Bethesda, Maryland, United States of America

Affiliation Naval Hospital Great Lakes, Great Lakes, Illinois, United States of America

Robin Scarborough

Affiliation Division of Scientific Resources, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America

Philip A. LoBue

Affiliation Division of Tuberculosis Elimination, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America

Alfred A. Lardizabal

Affiliation The New Jersey Medical School National Tuberculosis Center, University of Medicine and Dentistry of New Jersey, Newark, New Jersey, United States of America

Charles L. Daley

Current address: National Jewish Medical and Research Center, Denver, Colorado, United States of America

Affiliation Department of Medicine, University of California San Francisco, San Francisco, California, United States of America

Randall R. Reves

Affiliation Denver Public Health Department, Denver, Colorado, United States of America

John Bernardo

Affiliation The Pulmonary Center, Boston University School of Medicine, Boston, Massachusetts, United States of America

Brandon H. Campbell

Affiliation Division of Tuberculosis Elimination, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America

William C. Whitworth

Affiliation Division of Tuberculosis Elimination, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America

Gerald H. Mazurek

gym6@cdc.gov

Affiliation Division of Tuberculosis Elimination, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America

Competing Interests

The authors have read the journal's policy and recognize the following potential conflicts: Cellestis Ltd. provided antigens and kits that were used to measure interferon gamma by the commercial ELISA. This does not alter the authors' adherence to all the PLoS ONE policies on sharing data and materials. None of the authors have conflicts of interest.

Author Contributions

Conceived and designed the experiments: KLK GHM. Performed the experiments: AM RS KLK GHM. Analyzed the data: JG BD WCW BHC KLK GHM. Wrote the paper: KLK GHM. Data acquisition: AM RS SEW MJZ PAL AAL CLD RRR JB KLK GHM.