Peter Attia· MD
in the case of SARS one it has two things that make it really friendly to humans one it can't bounce back and forth between humans and animals and - you don't really spread you're very unlikely to spread it if you're not symptomatic you don't have to shut the world down but not only that you get to isolate people when they're sick and treat them before they treat others so the virus really gave up two big potential superpowers in the case of MERS sure it lives in animals and it's never gonna leave those animals but it has such a poor ability to spread between humans almost under any circumstance unless you're probably sticking a breathing tube in them that it was just so easy to contain