A team of New Zealand nurses have arrived in Samoa for a 10-day mission to re-train all vaccinating nurses.
It comes after two nurses mixed the wrong liquid with measles, mumps and rubella vaccines, causing the deaths of two babies last year.
The incident prompted Samoa to temporarily suspend the vaccinations and conduct an investigation.
The New Zealand team will be based in eight hospitals on the main islands of Upolu and Savai'i.
The two nurses implicated in the deaths, Luse Emo Tauvale and Leutogi Te'o, will be sentenced later this month.