All persons who went to the hospital in the Pidu district of Chengdu, Sichuan province, from 8 am on Sunday to 8 am on Monday must get a coronavirus test immediately - before Tuesday - the city's health authority said.

The order came after the district confirmed a case of COVID-19 on Monday.

It includes all patients, their companions, medical personnel and staff at the hospital, as well as anyone who visited the No 11 Group of Taiping village in Pidu district from Nov 23 to Sunday, the Pidu district epidemic prevention and control headquarters said.

A 69-year-old female resident of the village surnamed Lu had a cough, expectoration and other symptoms of COVID-19 on Sunday.

A CT scan at the Pidu district hospital found scattered small shadows in her two lungs. On Monday, her nucleic acid test came back positive.