One of the difficulties of this virus is that we're still learning about it and it's still very early on that we don't quite yet know everything about it. One thing to watch out for is that it appears that infected people are quite infectious during their prodromal period and are still shedding a lot of virus even after the symptoms have subsided. I don't think we know yet exactly how long people are actually infectious. Hopefully this stuff isn't a weaponized virus that found a way into the wild. The good news, if any, is that because there are infected people now outside China, western health agencies (and governments) will have this stuff genetically sequenced fairly quickly and therefore should be able to determine if it's weaponized or if it's "just" a virulent coronavirus. Either way, good early containment should allow this to burn out...