What is worth worrying about Wuhan Pneumonia might not its impacts on health, but the ones on economy. Only a small part of patients of Wuhan Pneumonia could suffer from severe symptoms, and most of them are slightly sick. As a result, many patients of Wuhan Pneumonia do not know they have got the disease themselves, thinking they are healthy. They go to public places without taking preventive measures, making Wuhan Pneumonia be spread very quickly. Therefore, to preclude Wuhan Pneumonia from being spread, many watertight measures would be taken by the government, such as prohibiting overseas travelers from coming, and factories postponing theirs downtime. If these kinds of watertight measures last for a long period of time, it could have substantial impacts on the economy, and bullish stock market could become bearish one.