Fear: North Korea will quarantine everyone coming from abroad for three weeks.
China apparently barely checks people coming in, and has trouble with hygiene in hospitals on top of that. Could be a new place for a bigger outbreak.
Maybe for healthworkers keeping track of their temperature for an elongated time would make sense. Some people have high temperatures by default, others have low temperatures by default. The latter could have a fever not noticed via protocol figures, where the former may be contained in quarantine when nothing is wrong.