(Yicai Global) May 13 -- Shanghai reported one more imported novel coronavirus case yesterday, taking the eastern metropolis' total confirmed Covid-19 cases to 660, the city's health commission said this morning.

The new addition is a Chinese citizen who traveled back to Shanghai from the UK on May 9, according to the commission.

Authorities have traced 42 people who had been in contact with the patient during their journey and placed them under quarantine, the commission said.

Four people who were confirmed imported Covid-19 cases were released from hospitals yesterday after a full recovery, according to the commission.

The commission logged no new confirmed domestically transmitted cases yesterday. It also reported no asymptomatic cases under observation in the city the same day.

Among the confirmed 321 imported Covid-19 cases, 22 patients are being treated, with two in serious condition, and 299 have been discharged upon recovery, the commission said.

It added one suspected case, also involving people who have recently been overseas, is undergoing further test.

Of the 339 local cases, seven have died and 332 patients have fully recovered and been released from hospital, the commission said.