A 51-year-old woman in Dongguan, Guangdong province named Mo, who had close contact with Lin, a cross-border truck driver from Hong Kong, tested positive for coronavirus.
Lin was confirmed to be an asymptomatic carrier in Shenzhen on Tuesday.
Mo is an accountant at a paper product company in Shishuikou village, Qiaotou township in Dongguan, according to the disease control and prevention center of Dongguan.
Lin loaded products at the company between Dec 28 and Jan 7. The two had close contact at a store in the company area on Sunday and Monday.
Mo is in stable condition at a hospital in Dongguan.
Among the 33 people who had close contact with Mo, 32 are under medical observation at designated quarantine places, and related information on the remaining person has been forwarded to the authorities of another city.
All 23,472 samples from residents in Shishuikou village tested negative. Testing of residents of the communities where Mo lives and traveled to started on Thursday.