A thread on why COVID (aka SARS-2) is a lot better at spreading than the original SARS virus.

1) it infects tissues in our throat where it can replicate undetected for days before causing symptoms https://twitter.com/PeterKolchinsky/status/1246975285792329730">https://twitter.com/PeterKolc...

2) which is why masks, which are really good at keeping our OWN cough droplets from spreading, is so helpful. Wearing them anytime we go outside, even if we don& #39;t feel sick, is a great way to keep from spreading COVID from asymptomatic infections.