Research ArticleImmunology Free access | 10.1172/JCI19316 Beate Kampmann,1 Cheryl Hemingway,1 Alick Stephens,1 Robert Davidson,2 Anna Goodsall,1 Suzanne Anderson,1 Mark Nicol,3 Elisabeth Schölvinck,1 David Relman,4 Simon Waddell,4 Paul Langford,1 Brian Sheehan,1 Lynn Semple,3 Katalin A. Wilkinson,1 Robert J. Wilkinson,2 Stanley Ress,3 Martin Hibberd,1 and Michael Levin5 1Department of Paediatrics and Wellcome Centre for Clinical Tropical Medicine, Imperial College London, London, United Kingdom.