The number of asymptomatic COVID-19 cases fell to zero in the city of Wuhan, capital of central China's Hubei Province, on Monday, according to local health authorities. 

The development comes at a time when the last three asymptomatic patients in the city have tested negative for two consecutive times. All the close contacts of COVID-19 patients have also been released from medical observation.

A total of 300 asymptomatic cases and 1,174 close contacts were traced after centralized nucleic acid testing was carried out in Wuhan from May 14 to June 1. Although no cases have been reported where asymptomatic virus carriers transmit the virus to others, the city has standardized the management of asymptomatic cases, strictly implementing closed-loop management of the entire process of detection, reporting, quarantine and disposal.