VERIFY: COVID vaccine 90% effectiveness explained

While the COVID-19 vaccines are highly effective, they are not perfect, and in rare cases, vaccinated people could still get sick. But just how many people could we expect this to happen to? A recent real-world study of Pfizer and Moderna vaccines found them to be 90% effective against coronavirus infection. Some have interpreted that to mean out of every ten people who are vaccinated, one will still get infected. Another iteration of this claim by one news outlet is that "for every million fully vaccinated people who fly, some 100,000 could still become infected." https://www.wcnc.com/article/news/ver...