About the Authors

Patrick Nadol

pen5@cdc.gov

Affiliations U.S. Centers for Disease Control and Prevention, Division of Global HIV/AIDS, Hanoi, Vietnam, Kirby Institute for Infection and Immunity, University of New South Wales, Sydney, Australia

Siobhan O’connor

‡ SOC, HD, LVNL, JK, ML, and TAN contributed equally to this work.

Affiliation U.S. Centers for Disease Control and Prevention, Division of Viral Hepatitis, Atlanta, Georgia, United States of America

Hao Duong

‡ SOC, HD, LVNL, JK, ML, and TAN contributed equally to this work.

Affiliation U.S. Centers for Disease Control and Prevention, Division of Global HIV/AIDS, Hanoi, Vietnam

Linh-Vi N. Le

‡ SOC, HD, LVNL, JK, ML, and TAN contributed equally to this work.

Affiliation U.S. Centers for Disease Control and Prevention, Division of Global HIV/AIDS, Hanoi, Vietnam

Pham Hong Thang

PHT, THT, HTTH, MSM, and JP also contributed equally to this work.

Affiliation National Institute of Hygiene and Epidemiology, Hanoi, Vietnam

Tran Hong Tram

PHT, THT, HTTH, MSM, and JP also contributed equally to this work.

Affiliation National Institute of Hygiene and Epidemiology, Hanoi, Vietnam

Hoang Thi Thanh Ha

PHT, THT, HTTH, MSM, and JP also contributed equally to this work.

Affiliation National Institute of Hygiene and Epidemiology, Hanoi, Vietnam

Michelle S. Mcconnell

PHT, THT, HTTH, MSM, and JP also contributed equally to this work.

Affiliation U.S. Centers for Disease Control and Prevention, Division of Global HIV/AIDS, Hanoi, Vietnam

Jeff Partridge

PHT, THT, HTTH, MSM, and JP also contributed equally to this work.

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

John Kaldor

‡ SOC, HD, LVNL, JK, ML, and TAN contributed equally to this work.

Affiliation Kirby Institute for Infection and Immunity, University of New South Wales, Sydney, Australia

Matthew Law

‡ SOC, HD, LVNL, JK, ML, and TAN contributed equally to this work.

Affiliation Kirby Institute for Infection and Immunity, University of New South Wales, Sydney, Australia

Tuan Anh Nguyen

‡ SOC, HD, LVNL, JK, ML, and TAN contributed equally to this work.

Affiliation National Institute of Hygiene and Epidemiology, Hanoi, Vietnam

Competing Interests

The authors confirm that Matthew Law is a PLOS ONE Editorial Board member and is also an author on this submission. Therefore, in-line with the PLOS ONE Competing Interests policies, the authors request that he not be a reviewer for this submission. This does not alter the authors’ adherence to PLOS ONE Editorial policies and criteria.

Author Contributions

Conceived and designed the experiments: PN SOC LVL JK ML TAN. Performed the experiments: PHT THT HTT TAN. Analyzed the data: PN HD JK ML. Contributed reagents/materials/analysis tools: PN HD JP JK ML. Wrote the paper: PN SOC HD MM JP JK ML.