Simple. Take a country with low overall vaccination rate (30% coverage), a justified mistrust of the local medical service, vaccine hesitancy caused by botched administration of the MMR vaccine, coupled with a lack of local intensive care facilities.
The Samoan outbreak is sad example of how a lack of vaccination can result in what should be preventable deaths.
A good overview here:
https://www.auckland.ac.nz/en/news/2...-epidemic.html
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