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They're powerful enough.

https://www.theguardian.com/us-news/2019/nov/16/vaccines-mea...

> More than half the states in America have seen a decline over the past decade in the take-up rates among kindergarten children of vaccines against diseases such as measles, mumps, hepatitis B and polio, as unfounded anti-vaccination theories have spread.

> The measles, mumps and rubella vaccine (MMR), which is the focus of much activity by the so-called anti-vaxxer movement, is especially vulnerable. Alarmingly, the study finds that more than half of the states – 26 in total – have vaccination rates that have fallen below the target of 95% which experts state is needed to provide maximum protection against the diseases.




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