About the Authors

Angela B Brueggemann

To whom correspondence should be addressed. E-mail: angela.brueggemann@zoo.ox.ac.uk

Affiliation Department of Zoology, University of Oxford, Oxford, United Kingdom

Rekha Pai

Affiliation Department of Gastrointestinal Sciences, Christian Medical College, Vellore, India

Derrick W Crook

Affiliation Nuffield Department of Clinical Laboratory Sciences, University of Oxford, Oxford, United Kingdom

Bernard Beall

Affiliation Centers for Disease Control, Atlanta, Georgia, United States of America

Competing Interests

Angela B. Brueggemann has been an advisor to Wyeth Vaccines and GlaxoSmithKline Biologicals and has received grant funding from both companies; Derrick W. Crook has received grant funding from Wyeth Vaccines.

Author Contributions

ABB performed the molecular work, analyzed the data, and wrote the manuscript. RP and BB were responsible for phenotypic characterisation of the strains and MLST genotyping. All authors contributed to the design of the study, discussed the results, and commented on the manuscript.