This week, @Vaccines is curated by Dr Jean-Marie Okwo-Bele, Director of the Department of Immunization, Vaccines and Biologicals at the World Health Organization. During his 35 years in public health, Dr Okwo-Bele has worked at country, regional and global levels in support of child health and immunization programmes, contributing to policymaking, capacity building, programme planning and evaluation, and disease surveillance. During the week, Dr Okwo-Bele will be tweeting about the latest data on global immunization coverage and compelling new evidence on how to implement large scale, globally synchronized public health activities. Follow along!