(Yicai Global) April 15 -- Shanghai detected four more imported novel coronavirus cases yesterday, taking the eastern metropolis' total confirmed Covid-19 cases to 622, the city's health commission said this morning.

All the new additions were Chinese citizens who took the same flight from Russia and arrived in Shanghai on April 10, according to the commission.

So far, 64 people aboard the flight from Russia have been confirmed as being infected with the Covid-19.

Authorities have traced 76 people who had been in contact with the patients during their journeys and placed them under quarantine, the commission said.

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

Among the 283 imported Covid-19 cases verified thus far, 143 patients are being treated, with one in serious condition, and 140 have been discharged upon recovery, the commission said.

Another 35 suspected cases, also involving people who had recently been overseas, are undergoing further tests, it added.

Of the 339 local cases, seven have died, four are in critical condition, and 328 patients have fully recovered and been discharged from hospital, the commission said.

Editor: Benedict Armour