Residents take nucleic acid tests at a testing post set up at a primary school in Dongxihu District in Wuhan, central China's Hubei Province, May 15, 2020. Wuhan will arrange nucleic acid tests for all residents who have not been tested before, in order to better know the number of asymptomatic cases of the novel coronavirus. The decision was made as the virus-ravaged city continued to report daily increases of asymptomatic infections, which raised concerns among the public.Photo:Xinhua

Wuhan, Central China's Hubei Province, declared zero COVID-19 silent carriers and close contacts on Tuesday as the last three asymptomatic patients were officially released from isolation after being tested negative twice for coronavirus, according to the Wuhan Health Commission. 

During the citywide nucleic acid testing carried out from May 14 to June 1 in Wuhan, a total of 300 asymptomatic patients were detected and put under medical observation.

More than 1,170 people who were close contacts of the patients have also been closely monitored. 

No transmission from COVID-19 silent carriers to others was found during the investigation.