OK, let’s imagine the absolute worst-case scenario and get it out of the way: the entire world catches this disease with about a 2.5% fatality rate. That would be 150,000,000 deceased. Which is a huge and tragic number, three times how many people WWII killed.
And 7,350,000,000 will NOT die from the virus.
This is not going to end civilization or The World As We Know It. It could be really unpleasant, uncomfortable and tragic but 98% of people will survive and get through it. Nowhere near something like the Medieval Black Death or a smallpox pandemic. Which humanity and civilization has also survived.
Here’s the good news: It almost certainly won’t be that bad.
There. You’ve got that scenario considered and out of the way. You may now return to the current situation which is much less dire. Yes, 30,000+ are infected and 700+ dead and it’s a terrible tragedy for Wuhan and Hubei, and to lesser extent the rest of China. But it’s not a global pandemic this afternoon. Governments and various agencies and even private companies are taking steps to contain the virus and make sure it doesn’t become a pandemic and those are all good things.
If anyone, personally, is feeling truly anxious about this then I’d suggest laying in sufficient supplies to shelter in place for a couple weeks (which will also be useful in the event of other events/emergencies so not a bad thing to have in general), getting enough sleep, and practicing good hygiene like frequent hand washing. Those steps will protect you not only against this virus - which, if you’re not in China is unlikely to affect you personally - but also provide some protection against the far more widespread colds and flus.
If you quarantine and area or a ship or a town it is actually pretty typical for infections to increase within the quarantine area for a time. If it’s not spreading but rather the cases are diminishing that’s a sign the disease is “burning” itself out and quarantine can be lifted soon.
A lot of people were probably infected a week or two ago and either not showing symptoms yet or just starting to. Some people probably either had minor illness that was overlooked or will only suffer mild or no symptoms. So cases will increase for a time before leveling off then starting to drop.
I’m more concerned with that happening in an impoverished nation in, say, Africa or, yes, India, than in the “West”, the industrialized, wealthy nations.