The novel (new) virus known as 2019- nCoV continues to spread throughout China and to countries across the world, the big question is: How long will the outbreak last—and how bad will it get? While some doctors have made predictions based on outbreaks of similar coronaviruses like severe acute respiratory syndrome (SARS) and Middle East respiratory syndrome (MERS), the short, if unsatisfying, answer is that no one is exactly sure.