> follow all possible contacts. Not a practical strategy for thousands of conference attendees packed closely together for a short period of time before flying

> follow all possible contacts. Not a practical strategy for thousands of conference attendees packed closely together for a short period of time before flying back home. This virus is too infectious and has too long of an incubation period. That's why so many public events are being canceled. This exact scenario is playing out right now aboard the cruise ship docked in Japan.