A recovered novel coronavirus patient in Wangkui county, Heilongjiang province, tested positive for the virus on Saturday, local government said on Sunday.

During nucleic acid testing conducted for health management of recovered patients on Saturday, the case was found to be positive for the virus.

The patient was diagnosed with confirmed cases of COVID-19 on Jan 13 and underwent isolation and treatment in a designated hospital.

Then the patient returned home on March 1 and was under home quarantine until March 17.

Results of the nucleic acid testing conducted on March 29 and April 13 came back negative.

Now the patient is in isolation and receiving medical observation in Wangkui People's Hospital, showing no clinical symptoms and no changes in blood analysis or radiography.

All 31 close contacts that have been traced are under centralized isolation and all nucleic acid test results are negative.