(Yicai Global) April 10 -- Shanghai had detected three more imported novel coronavirus cases as of yesterday, taking the eastern metropolis' total confirmed Covid-19 cases to 555, the city's health commission said this morning.

Among the new additions, there were two Chinese citizens and one Brazilian. They arrived in Shanghai from Russia, the United States and Brazil respectively, according to the commission.

Authorities have traced 16 people who had been in contact with the patients during their journeys and placed them under quarantine, it added.

Five suspected cases, also involving people who have recently been overseas, are undergoing further tests.

The commission logged no new suspected or confirmed domestically transmitted cases yesterday. It also reported no asymptomatic cases under observation in the city as of yesterday.

Shanghai has confirmed 555 Covid-19 cases so far, including 216 from overseas. Some 122 of the patients who brought the virus into the city from outside China are being treated, with one in serious condition, and 94 have been discharged upon recovery.

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