(Yicai Global) April 22 -- Shanghai reported one more imported novel coronavirus case yesterday, taking the eastern metropolis' total confirmed Covid-19 cases to 639, the city's health commission said this morning.

The new addition, a Chinese citizen who visited relatives in the UK, traveled back to Shanghai on April 18, according to the commission.

Authorities have traced 19 people who had been in contact with the patient during the journey and placed them under quarantine, it added.

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

Shanghai has confirmed 639 Covid-19 cases so far. Among the confirmed 300 imported Covid-19 cases, 101 patients are being treated, with one in serious condition and 199 have been discharged upon recovery.

The commission added 19 suspected cases, also involving people who have recently been overseas, are undergoing further tests.

Of the 339 local cases, seven have died, one is in critical condition, and 331 patients have fully recovered and been discharged from hospital, it added.