Three people - two babies and an adult - are suspected to have died of measles in Samoa.
The government has ordered all preschools to close until further notice as it contends with the epidemic, and other governments are also scaling up their responses.
Dominic Godfrey has been following the story and Jamie Tahana asked him what the latest details are.
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Director General of Health Leausa Dr Take Naseri (middle) with two senior doctors involved in the preparations and awareness of measles in Samoa. Photo: RNZ Pacific / Tipi Autagavaia