Two medical staffers at Shanghai Public Health Clinical Center Photo: Chen Xia/GT

A total of 12 imported cases of COVID-19 were discharged from hospital in Shanghai after receiving treatment, the Shanghai Health Commission announced on Thursday.

The 12 recovered patients are all Chinese nationals, aged from 23 to 52 years old, and took different airline carriers from overseas locations, according to the commission. They were diagnosed and transferred to the Shanghai Public Health Clinical Center, a designated hospital for coronavirus patients, from August 13 to 17. 

All of the cases showed mild and ordinary symptoms, and accepted the treatments as prescribed, including anti-infection, traditional Chinese medicine and strengthening nutrition treatments at the hospital.

Shen Yinzhong, director of the center's medical department, said that Shanghai has strengthened its follow-up work for recovered COVID-19 patients after being discharged from hospital. 

The recovered patients are required to undergo a 14-day quarantine and health check soon after being discharged from hospital, Shen said.

Patients also need to go to a designated hospital to check their health condition the second and fourth week after receiving treatment and being discharged, Shen noted, adding that recovered patients still need to maintain good personal and environmental hygiene, good nutrition, and have enough rest and engage in moderate exercise.

So far, Shanghai has reported 546 imported cases and 342 domestically transmitted cases of COVID-19. A total of 819 patients have already been discharged from hospital.