A total of 13 locally transmitted COVID-19 confirmed cases and nine asymptomatic carriers were reported as of 1 p.m. Thursday in Nanjing, capital of east China's Jiangsu Province after new infections emerged at an airport earlier this week.

All of them are under quarantine and receiving treatment at the designated hospital and are in stable condition, according to Xu Minsheng with the municipal health commission.

The city launched an all-inclusive nucleic acid testing campaign Wednesday. Medical personnel continued the testing campaign overnight in residential communities. Community workers and volunteers have been mobilized to help maintain order as people queue for tests.

The mega-city with a population of more than 9.3 million has classified 10 areas as medium-risk for COVID-19 and implemented closed management.

The municipal government has urged residents not to leave the city unless necessary. Anyone leaving the city must produce a negative nucleic acid test certificate issued within 48 hours of their departure. The rule does not apply to transit passengers.

Produced by Xinhua Global Service