Shanghai reported two locally transmitted COVID-19 cases and three local asymptomatic cases on Thursday.
All the five people, who have been sent to the Shanghai Public Health Clinical Center, are related to an imported asymptomatic COVID-19 case reported in the city on Tuesday.
They tested positive during screening and quarantine as close or secondary contacts to the imported case, Wu Jinglei, head of the Shanghai Health Commission, said at a press briefing on Thursday.
The two new confirmed cases, both close contacts of the imported case, work at a milk tea store at 228 Yuyuan Road in Jing'an District. They are showing mild symptoms.
The 18-year-old female employee has received two shots of the COVID-19 vaccine, while her 17-year-old male colleague, a part-time worker, has not been jabbed.
Another female employee at the store and her sister, who live together, have been diagnosed as asymptomatic cases. They are fully vaccinated.
A 26-year-old unemployed female, another close contact of the imported case, has also been diagnosed as an asymptomatic case. She said she had taken full vaccination overseas.
A total of 304 people who had close links with the five people have been put under medical observation. A total of 30,783 people have been screened, with 30,128 results negative.
Health authorities collected 1,626 environmental samples and 34 pieces, mainly at the places they live, have tested positive.
The milk tea store has been elevated to a medium-level risk area.