Two residents of Chongqing's Yubei district tested positive for COVID-19 in Chengdu, Sichuan province, local authorities said on Wednesday night.

Li (female) and Chen (male) are a couple. They toured Zhangjiajie, Hunan province, from July 21 to 24, and returned home to Chongqing on July 25. The next day, they drove to Sichuan province. After discovering that some newly found infections in Dalian province had also visited Zhangjiajie, the couple went to a hospital in Chengdu for nucleic acid testing on Tuesday. And the results showed positive.

According to the Chongqing Health Commission, as of 21:30 on Wednesday, 33 close contacts and 255 secondary contacts in Chongqing had been tracked. Medical workers are carrying out nucleic acid tests — with 34 samples negative and the rest still under testing. 78 environmental samples tested negative.

Chen Meiling contributed to this story.