(Yicai Global) June 8 -- Shanghai reported one more imported novel coronavirus case yesterday, taking the eastern metropolis' total confirmed Covid-19 cases to 678, the city's health commission said this morning.

The new addition is a Chinese citizen who had been studying in the United States and traveled back to Shanghai on June 4, according to the commission.

Authorities have traced 45 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 337 imported Covid-19 cases so far, seven patients are being treated and 330 have been discharged upon recovery, the commission said.

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

Of the 341 local cases, seven have died and 334 patients have fully recovered and been released from hospital, the commission said.