Vaccines on average are about 80% effective. The other 20% can catch a disease they been vaccinated against. Nothing is perfect. Measles vaccine is over 90% effective (vaxopedia.org). There are plenty of vaccinated people that get sick anyway.
Vaccines *on average* are about 80% effective. The other 20% can catch a disease they been vaccinated against. Nothing is perfect. [Measles vaccine is over 90% effective](https://vaxopedia.org/2016/10/09/effectiveness-rates-of-vaccines/). There are plenty of vaccinated people that get sick anyway.
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