WUHAN, May 12 (Xinhua) -- No new confirmed cases of the novel coronavirus disease (COVID-19) were reported in central China's Hubei Province Monday, the provincial health commission said Tuesday.

As of Monday, the province had 606 asymptomatic cases under medical observation, after 11 such cases were added and 20 released from quarantine.

Six patients remained in hospital in the province, with one in severe and one in critical condition.

A total of 283,216 close contacts of COVID-19 patients in the province had been tracked by Monday, 983 of whom were still under medical observation.

By Monday, death toll from the virus in the province stood at 4,512, including 3,869 in Wuhan.

Hubei had so far reported 68,134 confirmed COVID-19 cases in total, including 50,339 in Wuhan.