The only reason they stay healthy is because they hide in the herd immunity of western nations. Try that in Samoa where they had a 31% vaccination rate and no herd immunity.
Here's the Wikipedia article on an R0, or basic reproduction number. Honestly, once you understand this herd immunity is an easy jump - just reduce R0 below 1 and voila https://en.wikipedia.org/wiki/Basic_reproduction_number …
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When R0>1, the disease will spread. If R0<1, herd immunity kicks in. With a sufficiently low R0, you can almost entirely prevent the spread of a disease Funnily enough, the maths has nothing to do with vaccination at all! It's just maths
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