About the Authors

Ee Laine Tay

eelaine.tay@mh.org.au

Affiliations Victoria Infectious Diseases Reference Laboratory, Melbourne, Australia, National Centre for Epidemiology and Population Health, The Australian National University, Canberra, Australia

Kristina Grant

Affiliation Victoria Infectious Diseases Reference Laboratory, Melbourne, Australia

Martyn Kirk

Affiliation National Centre for Epidemiology and Population Health, The Australian National University, Canberra, Australia

Anthony Mounts

Affiliation Global Influenza Programme, World Health Organization, Geneva, Switzerland

Heath Kelly

Affiliations Victoria Infectious Diseases Reference Laboratory, Melbourne, Australia, National Centre for Epidemiology and Population Health, The Australian National University, Canberra, Australia

Competing Interests

Anthony Mounts is with the World Health Organisation Global Influenza Programme. The other authors have no commercial or other association that might pose a conflict of interest. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials. That co-author Martyn Kirk is an Academic Editor for PLOS ONE. This does not alter our adherence to all the PLOS ONE policies on sharing data and materials

Author Contributions

Conceived and designed the experiments: ET KG HK AM. Analyzed the data: ET KG MK HK. Contributed reagents/materials/analysis tools: AM. Wrote the manuscript: ET HK. Provided critical revisions to the article: ET KG MK AM HK.