About the Authors
Laboratory of Emerging Pathogens, Division of Emerging and Transfusion Transmitted Diseases, Center for Biologics Evaluation and Research, U. S. Food and Drug Administration, Bethesda, Maryland, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: RN AD. Performed the experiments: RN FFA CG. Analyzed the data: RN FFA AD. Contributed reagents/materials/analysis tools: RN FFA AD. Wrote the paper: RN FFA AD.