Measles has killed 72 people in Samoa since October, in a deadly catastrophe that has highlighted the country's low vaccination rates - just 16 percent had both doses of the measles vaccine last year - and the influence of a growing anti-vaccination movement there.
But critics have also blamed New Zealand for the epidemic.
Samoa's Prime Minister, Tuila'epa Sa'ilele Malielegaoi, and senior health officials have maintained measles travelled to Samoa from New Zealand.