evidence: Since 2017, a global resurgence of measles cases has been affecting all regions of the world. In global immunization surveys, coverage for the second dose of measles-containing vaccine (MCV2) was 69%, with significant variability between regions. In the Asia Pacific region, outbreaks and clusters of measles cases are being reported from countries where measles has been eliminated, including Australia, Japan, New Zealand, Republic of Korea, as well as higher incidence in endemic countries such as Lao PDR, Malaysia, the Philippines, Thailand and Viet Nam. To date, Samoa, Tonga, Fiji and American Samoa have reported measles cases. The outbreaks in Samoa and Tonga are caused by the D8 strain (genotype) of measles virus. Measles vaccine coverage varies in Pacific island countries and areas, ranging from 31% in Samoa to 99% in the Cook Islands, Nauru and Niue.