CNN article on how to safely fly claims that 90% vaccine efficacy means that for every million who fly, we could have 100,000 infections. NO NO NO. That’s not what that number means. Also, this didn’t even happen when millions flew unvaccinated. So how could it make sense now?

I realize it’s tough. Everyone is suddenly writing about the pandemic, no matter what their topic. And vaccine efficacy is a relative measure, so those are always pesky. But we’ve had the vaccines for many months now, and by now one would hope for a slightly better understanding.

Yeah. That’s why it isn’t a good way to represent the risk of flying even if you could concoct a scenario under which you can imagine that number. https://twitter.com/astoraaron/status/1381225496067899392