(Yicai Global) May 24 -- Shanghai reported one more imported novel coronavirus case yesterday, taking the eastern metropolis' total confirmed Covid-19 cases to 668, the city's health commission said this morning.

The new addition is a Chinese citizen who traveled back to Shanghai on May 20 from the Unites States, according to the commission.

Authorities have traced 25 people who had been in contact with the patient during their journey and placed them under quarantine, the commission said.

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 327 imported Covid-19 cases so far, 12 patients are being treated, with one in serious condition, and 315 have been discharged upon recovery, the commission said.

It added five suspected cases, also involving people who had recently been overseas, are undergoing further tests.

Of the 341 local cases, seven have died, two are being treated and 332 patients have fully recovered and been released from hospital, the commission said.