Health experts in Japan continue to refine the advice they offer in response to the coronavirus outbreak. They're now urging people, especially younger generations, to be on the alert even if they don't show major symptoms.

Japan Community Healthcare Organization President Shigeru Omi said, " We have come to believe that people with mild symptoms play an important role in spreading the virus without knowing it. In particular, young people are unlikely to become seriously ill, making it very difficult to see the danger they may pose to others. As a result, they infect many middle aged and elderly people, putting them at risk."