Three patients who had made a recovery from COVID-19 tested positive again when self-isolating at home in northern Vietnam, according to local health authorities.
The three live in Luong Tai District, Bac Ninh Province, the provincial Committee for COVID-19 Prevention and Control said on Sunday.
They retested positive for the novel coronavirus on March 25, the committee said in a report.
The three had tested negative three times in a row before being discharged from the hospital and being required to self-isolate at home for two more weeks.
The patients are being monitored at the Bac Ninh General Hospital.
There is no risk of community transmission from the three as they have strictly followed guidelines on self-isolation, the committee said.
Health workers have fumigated their homes and taken other safety measures.
Local authorities are calling on residents to wear a face mask in public, sanitize hands frequently, keep a distance in social interactions, declare health status, and avoid crowded places.
Vietnam recorded zero coronavirus cases on Monday morning, with the national tally standing at 2,591 and recoveries reaching 2,308, according to the Ministry of Health’s data.
The country has registered 1,603 local infections so far, including 910 since January 27.
Thirty-five patients have died, most having suffered serious comorbid health conditions.