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DOI: 10.1186/1471-2334-4-13 Address for correspondence: Teun Bousema, Infectious and Tropical Diseases, Immunology Unit, Rm 238C, London School of Hygiene and Tropical Medicine, Keppel St, London WC1E 7HT, UK; email: teun. bousema@lshtm.ac.uk Use of trade names is for identiﬁcation only and does not imply endorsement by the Public Health Service or by the U.S. Department of Health and Human Services. Emerging Infectious Diseases • www.cdc.gov/eid • Vol. 16, No. 3, March 2010 399