In Wuhan they tested about 10 Million people and concluded "There were no positive tests amongst 1,174 close contacts of asymptomatic cases". https://www.natur

In Wuhan they tested about 10 Million people and concluded "There were no positive tests amongst 1,174 close contacts of asymptomatic cases". https://www.nature.com/articles/s41467-020-19802-w https://www.nature.com/articles/s41467-020-19802-w