(Yicai Global) May 28 -- Shanghai reported one more imported novel coronavirus case yesterday, taking the eastern metropolis' total confirmed Covid-19 cases to 671, the city's health commission said this morning.

The new addition is a Chinese citizen who had been working in Mexico and traveled back to Shanghai on May 24, according to the commission.

Authorities have traced six 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 330 imported Covid-19 cases so far, eight patients are being treated and 322 have been discharged upon recovery, the commission said.

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

Of the 341 local cases, seven have died, one is being treated and 333 patients have fully recovered and been released from hospital, the commission said.