Unfortunately, this isn't a valid assumption. Lots of people come in to work sick - just yesterday we had to ask our boss to send someone home because they showed up to work caughing and sneezing all day (Today, two other coworkers aren't coming in because they're not feeling well...)
But reports at sueddeutsche.de say that the (by now) 4 individuals in isolation are feeling very well, and are not showing any symptoms.
I also don't think the virus is a death sentence. I haven't done sufficient research to strongly support this opinion, but from what I've read across news articles is that most fatal cases were individuals with certain pre-conditions. That doesn't mean there's nothing to worry, but this isn't humanities downfall.