About the Authors

Glynis Dunn

Affiliation Division of Virology, National Institute for Biological Standards and Control, Potters Bar, Hertfordshire, United Kingdom

Dimitra Klapsa

Affiliation Division of Virology, National Institute for Biological Standards and Control, Potters Bar, Hertfordshire, United Kingdom

Thomas Wilton

Current Address: Janssen Infectious Diseases and Vaccines, Crucell Holland B.V., Leiden, The Netherlands

Affiliation Division of Virology, National Institute for Biological Standards and Control, Potters Bar, Hertfordshire, United Kingdom

Lindsay Stone

Affiliation Division of Virology, National Institute for Biological Standards and Control, Potters Bar, Hertfordshire, United Kingdom

Philip D. Minor

Affiliation Division of Virology, National Institute for Biological Standards and Control, Potters Bar, Hertfordshire, United Kingdom

Javier Martin

Javier.Martin@nibsc.org

Affiliation Division of Virology, National Institute for Biological Standards and Control, Potters Bar, Hertfordshire, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JM. Performed the experiments: GD DK TW LS JM. Analyzed the data: JM. Contributed reagents/materials/analysis tools: GD DK TW LS JM. Wrote the paper: JM PDM.