Two tourists tested positive for COVID-19 in the period from Saturday to 7 am Sunday in northwest China's Shaanxi Province, according to the provincial health commission.
The tourists, both 62 years old, are husband and wife who traveled from Shanghai. On October 9, they flew from Shanghai and transferred at Xi'an, Shaanxi Province, for a flight to Zhangye, Gansu Province.
After that, they went on road trips in Gansu and Inner Mongolia before flying back to Xi'an on October 15.
The couple have been put under observation at a hospital in Xi'an.
The Chinese mainland reported 22 imported COVID-19 cases and two locally-transmitted infections on Sunday, the National Health Commission said in its daily report on Monday.
The new local infections were reported in Xi'an, northwest China's Shaanxi Province, the commission said.
No new suspected cases or deaths from COVID-19 were reported on Sunday.