A total of 15 people have been quarantined after a novel coronavirus disease (COVID-19) patient retested positive following her recovery in the northern Vietnamese province of Ninh Binh.

The 34-year-old Vietnamese woman, who was Vietnam’s COVID-19 patient No. 325, has recently retested positive for the novel coronavirus after being declared virus-free, the provincial Center for Disease Control (CDC) confirmed on Tuesday.

The patient was first diagnosed with COVID-19 in Russia.

She received treatment in the country and was confirmed to have recovered from the disease before boarding a flight to Vietnam on May 13.

She was sampled for testing after her arrival in the northern province of Hai Duong. The result came back positive.

Patient No. 325 was treated at the Hai Duong Hospital for Tropical Diseases.

She was quarantined for 14 days after her recovery and discharged from the infirmary following the isolation period.

The woman then returned to her hometown in Ninh Binh Province.

On June 12, the Ninh Binh General Hospital carried out a test on the patient, and the result returned positive for the virus.

She tested positive again on June 15 after being screened for COVID-19 by the Ninh Binh CDC.

The patient has been brought back to the hospital for treatment.

Fifteen people, including her son, have been quarantined in relation to the case.

Vietnamese doctors have said that those retesting positive after having recovered are not infectious because what the tests pick up are merely remnants of the virus.

Lab experiments indicated that no virus grew again from samples taken from such patients, said Nguyen Van Kinh, former director of the National Hospital for Tropical Diseases in Hanoi.

Vietnam’s COVID-19 tally is currently at 335, with 325 having beaten the virus, according to Ministry of Health statistics.

No death from the disease has been reported in the country.

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