In some ways, this is a straightforward story about Samoa's low vaccination rate, explained Julie Leask, a professor at the University of Sydney who researches vaccine hesitancy."If you don't keep vaccination rates high, measles will spread quickly and effectively," she said. "In other ways, it's a complex story and many questions need to be asked. How the nurses so easily missed the dilutent and what systemic issues contributed to this error in administration."In the midst of a vaccination crisis, anti-vaxxers visit SamoaIn June, just months before the outbreak, two well-known and well-established anti-vaccine advocates, Robert Kennedy Jr. and Taylor Winterstein, the wife of an Australian rugby player, met in Samoa.While it's not known what the two discussed, Winterstein, who posted an Instagram photo of herself with Kennedy at the time, has been spreading anti-vaccine conspiracy theories related to Samoa throughout the outbreak.