In the Asian and Pacific region, almost 87 per cent of children 1 year of age or younger are immunized against measles. However, this aggregate masks differences between subregions. East and North-East Asia (98.7 per cent), and North and Central Asia (96.7 per cent) have close to a 100 per cent immunization rate. South and South-West Asia has the lowest rate (78.5 per cent), followed by the Pacific (81.7 per cent).