China has launched an App which can check whether a patient who has been diagnosed with Covid-19 or suspected patient is on the same train or plane, and sits in front three rows.
There is now one more data in this application, the contacts of thesilent carriers.
The data is updated daily, and the range is for people who take the same plane and train with the silent carriers within 14 days and sit in the front and rear rows.
你曾坐在无症状感染者周围吗？这里能查！！！
