About the Authors

José Peña

jpena360@yahoo.com (JP); eharris@berkeley.edu (EH)

Affiliations Division of Infectious Diseases and Vaccinology, School of Public Health, University of California, Berkeley, California, United States of America, Graduate Group in Microbiology, Department of Plant and Microbial Biology, University of California, Berkeley, California, United States of America

Eva Harris

jpena360@yahoo.com (JP); eharris@berkeley.edu (EH)

Affiliations Division of Infectious Diseases and Vaccinology, School of Public Health, University of California, Berkeley, California, United States of America, Graduate Group in Microbiology, Department of Plant and Microbial Biology, University of California, Berkeley, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JP. Performed the experiments: JP. Analyzed the data: JP. Contributed reagents/materials/analysis tools: JP EH. Wrote the paper: JP EH.