When airports are screening passengers for a communicable disease, you know it’s serious. No one wants another H1N1. As of this writing, the Wuhan China outbreak of coronavirus has infected more than 800, killed 41 people, and found its way to the United States in two confirmed cases. No doubt tomorrow’s news will broadcast even larger numbers. Public health officials are still working to figure out exactly how the coronavirus is spreading, but they are clear on one point: It needs to be contained. Data visualization can help them do that.