About the Authors
Division of Infectious Diseases, Veterans Affairs Medical Center and the University of California, San Francisco, California, United States of America
Department of Biology and Center for Microbial Sciences, San Diego State University, San Diego, California, United States of America
Department of Pediatrics, University of California at San Diego, School of Medicine, La Jolla, California, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: HSS RM BJK KSD PMS. Performed the experiments: HSS RM BJK. Analyzed the data: HSS RM BJK KSD PMS. Contributed reagents/materials/analysis tools: HSS KSD PMS. Wrote the paper: HSS KSD PMS.