About the Authors

Gregory L. Peterfreund

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

Lee E. Vandivier

Affiliation Department of Genetics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America

Rohini Sinha

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

Andre J. Marozsan

Current address: Alexion Pharmaceuticals, Cheshire, Connecticut, United States of America

Affiliation Progenics Pharmaceuticals, Tarrytown, New York, United States of America

William C. Olson

Affiliation Progenics Pharmaceuticals, Tarrytown, New York, United States of America

Jun Zhu

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

Frederic D. Bushman

bushman@mail.med.upenn.edu

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

Competing Interests

Authors AM and WO are or have been employees of Progenics, developer of the antitoxin antibody used in this study. Progenics has submitted patent applications for these antibodies. Progenics contracted Ricerca to carry out the animal experimentation on their behalf. The project was designed by the authors' lab and author AM from Progenics with input on feasibility and cost from Ricerca. All animal handling, infection, and sample generation were carried out by Ricerca as directed by AM and Progenics. There are no products in development or marketed products to declare. 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: GLP AJM WCO JZ FDB. Performed the experiments: GLP WCO. Analyzed the data: GLP LEV RS. Contributed reagents/materials/analysis tools: RS AJM. Wrote the paper: GLP JZ FDB.