Three healthcare workers rode motorbikes into the Indonesian city of Sumenep, carrying doses of measles vaccine and a list of children who needed them. With blue medical boxes in hand, they went from house to house administering the life-saving shots.The health workers on wheels are part of the regional government’s latest efforts to curb a deadly measles outbreak on Madura Island that has persisted for the past nine months. More than 2,600 children have already been infected this year, and 20...