About the Authors

J. Christian Pérez

jperez@ucsf.edu, jchris_perez@yahoo.com

Affiliation Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, California, United States of America

Alexander D. Johnson

Affiliation Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.