B2M and measles: The authors thank the team at Sukuta Health Centre and the parents of participating infants; Sarah Nogaro for field assistance; Sarah Burl for laboratory management; Fiona van der Klis and Marianne van der Sande for DTP antibody assays; Jainaba Njie-Jobe for measles antibody assays; and Samuel Nyamweya for performing the beta-2 microglobulin assays.