of the coronavirus in recent weeks although health officials here still worry about potential new clusters. well from seoul south korea i'm now joined by professor jones sun associate professor at the bob school of planning university college londonofessor after a peak at the beginning of march south korea has kept new infections very low you say besides a testing program that's due to surveillance how yes tracing through to surveillance technology played a pretty part in this fight against the corner. if the country has pretty be complicity with testing if you don't know who to test the testing capacity has only limited the use so to find out who to test disobedience technology was really cool so the cool east to find though that it would be one in every single one patient to come from the patient contacted in the past so ted way you can find out who this patient fighters from and to who this patient could have been itas to what kind of data exactly has the government there gathered. because the initial data is the interview of people experts interview interview patients who too is king pin but then they sent a police quote your excess to police state. resources or what they tell you through police and that's a credit card trans