Border closure apparently cannot effectively contain the virus.
That is because, a person can be infectious BEFORE ANY symptoms show.
What is more, some people will not show any symptoms while being infected.
Thus, the thermal scanners used at customs all around the world cannot effectively stop the carriers and consequently the virus from spreading.
Well, bringing it back to the topic, that menas that it is simply foolish to stop trading activities. Humans are the vectors, not cargo.
Best thing to do is to maintain personal hygiene and take necessary precautions (face masks, seek medical attention for illness and stay away form crowded places and minimise/ eliminate contact with high risk potentials....blah blah)
Edit: Information source from my local newspaper... Yeah... agree that the whole thing is blown a tad out of proportion...