Take a vaccine with a 95 percent rate of effectiveness, get a large enough sample size, and statistically speaking, it should be pretty obvious what’s bound to happen.

So while conspiracy-minded anti-vaxxers point fingers over news that the first fully vaccinated cruise to set sail in North America included a couple of COVID cases, anyone who knows 95 is less than 100 ought to have assumed this would be the case – if not on the first cruise, then certainly within the first few.