About the Authors

Susan Scheer

susan.scheer@sfdph.org

Affiliation San Francisco Department of Public Health, HIV Epidemiology Section, San Francisco, California, United States of America

Shoshanna Nakelsky

Affiliation Division of HIV and STD Programs, Los Angeles County Department of Public Health, Los Angeles, California, United States of America

Trista Bingham

Affiliation Division of HIV and STD Programs, Los Angeles County Department of Public Health, Los Angeles, California, United States of America

Mark Damesyn

Affiliation Office of AIDS, California Department of Public Health, Sacramento, California, United States of America

Dan Sun

Affiliation Office of AIDS, California Department of Public Health, Sacramento, California, United States of America

Chi-Sheng Chin

Affiliation San Francisco Department of Public Health, HIV Epidemiology Section, San Francisco, California, United States of America

Anthony Buckman

Affiliation San Francisco Department of Public Health, HIV Epidemiology Section, San Francisco, California, United States of America

Karen E. Mark

Affiliation Office of AIDS, California Department of Public Health, Sacramento, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Obtained permission for specimen testing: SN DS MD AB. Obtained specimens and other information: SN DS MD AB. Managed the incidence surveillance program: SS TB SN MD AB KEM. Read and provided comments on the final manuscript: SS SN TB MD DS C-SC AB KEM. Conceived and designed the experiments: SS SN TB MD KEM. Analyzed the data: SN DS C-SC. Wrote the paper: SS SN TB MD KEM.