About the Authors

Scott P. Grytdal

spgrytdal@cdc.gov

Affiliation Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States of America

Emilio DeBess

Contributed equally to this work with: Emilio DeBess, Lore E. Lee, David Blythe, Patricia Ryan

Affiliation Public Health Division, Department of Human Services, Oregon Health Authority, Portland, OR, United States of America

Lore E. Lee

Contributed equally to this work with: Emilio DeBess, Lore E. Lee, David Blythe, Patricia Ryan

Affiliation Public Health Division, Department of Human Services, Oregon Health Authority, Portland, OR, United States of America

David Blythe

Contributed equally to this work with: Emilio DeBess, Lore E. Lee, David Blythe, Patricia Ryan

Affiliation Office of Infectious Disease and Epidemiology, Maryland Department of Health and Mental Hygiene, Baltimore, MD, United States of America

Patricia Ryan

Contributed equally to this work with: Emilio DeBess, Lore E. Lee, David Blythe, Patricia Ryan

Affiliation Office of Infectious Disease and Epidemiology, Maryland Department of Health and Mental Hygiene, Baltimore, MD, United States of America

Christianne Biggs

Affiliation Office of Infectious Disease and Epidemiology, Maryland Department of Health and Mental Hygiene, Baltimore, MD, United States of America

Miriam Cameron

‡ These authors also contributed equally to this work.

Affiliation Kaiser Permanente of the Mid-Atlantic States, Rockville, MD, United States of America

Mark Schmidt

‡ These authors also contributed equally to this work.

Affiliation Kaiser Permanente Center for Health Research, Portland, OR, United States of America

Umesh D. Parashar

Affiliation Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States of America

Aron J. Hall

Affiliation Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: LEL DB PR MC MS UDP AJH. Performed the experiments: CB. Analyzed the data: SPG. Contributed reagents/materials/analysis tools: ED LEL DB PR MC MS. Wrote the paper: SPG AJH.