About the Authors

Adam L. Cohen

DVJ1@cdc.gov

Affiliations Influenza Division, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America, Influenza Program, Centers for Disease Control and Prevention—South Africa, Pretoria, South Africa, United States Public Health Service, Rockville, Maryland, United States of America

Meredith McMorrow

Affiliations Influenza Division, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America, United States Public Health Service, Rockville, Maryland, United States of America

Sibongile Walaza

Affiliations Centre for Respiratory Diseases and Meningitis, National Institute for Communicable Diseases, Sandringham, South Africa, School of Public Health and Faculty of Health Science, University of the Witwatersrand, Johannesburg, South Africa

Cheryl Cohen

Affiliations Centre for Respiratory Diseases and Meningitis, National Institute for Communicable Diseases, Sandringham, South Africa, School of Public Health and Faculty of Health Science, University of the Witwatersrand, Johannesburg, South Africa

Stefano Tempia

Affiliations Influenza Division, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America, Influenza Program, Centers for Disease Control and Prevention—South Africa, Pretoria, South Africa, Centre for Respiratory Diseases and Meningitis, National Institute for Communicable Diseases, Sandringham, South Africa

Marissa Alexander-Scott

Affiliations Division of Applied Research and Technology (DART), National Institute for Occupational Safety and Health (NIOSH), Centers for Disease Control and Prevention, Cincinnati, Ohio, United States of America, University of Illinois, Springfield, Illinois, United States of America

Marc-Alain Widdowson

Affiliation Influenza Division, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: ALC MW. Performed the experiments: ALC MM SW CC ST MA. Analyzed the data: ALC MM SW CC ST MA MW. Wrote the paper: ALC MM SW CC ST MA MW.