Visualizes vaccine efficacy rates from clinical trial data.
Contrary to very reasonable assumptions, the vaccine efficacy rate is not the average chances you'll be protected from Covid. Instead, the efficacy rate is a reduction in risk: with a 90% effective vaccine, people can expect their risk of contracting covid to be reduced by 90%.
But what's our "original" risk of catching covid, and what's our new, lower risk once we're fully vaccinated? For individuals, that depends on a lot of things like age, health status, etc that are hard to predict. But when talking in averages, there is enough data out there to get at least a rough estimate of our chances of protection. And I think people should know.