Patients 1266-1269, three women and a man aged 25-35, are residents of Nghe An, Thanh Hoa and Son La provinces.

They landed October 31 at the Van Don Airport in Quang Ninh Province on Vietnam Airlines flight VN5062 from Russia and were quarantined in Hung Yen Province upon arrival.

After the second test of their samples returned positive for the novel coronavirus Friday, they were moved for treatment to the National Hospital for Tropical Diseases 2 in Hanoi.

Patients 1270-1280, 10 women and one man aged 19-55, include a Russian expert. The Vietnamese are residents of Thai Binh, Nghe An, Khanh Hoa, Bac Giang, Dak Lak, Thanh Hoa, Quang Tri and Hai Phong.

The 11 persons landed November 11 at the Cam Ranh Airport in Khanh Hoa on Vietnam Airlines flight VN5062 from Russia and were quarantined in the central province.

Test results confirmed Saturday they were positive for the coronavirus. They are being treated at the Khanh Hoa Hospital for Tropical Diseases, Cam Ranh Regional General Hospital and Ninh Sim-Ninh Hoa Clinic in the same province.

"Patient 1281" is a 34-year-old man from Ha Tinh Province who landed October 31 at the Van Don Airport on Vietnam Airlines flight VN5062 from Russia and was quarantined in Hoa Binh Province. He is being treated at the northern province's Hoa Binh General Hospital after test results confirmed Sunday that he was positive for the virus.

The 16 additions have raised Vietnam's Covid-19 tally to 1,281 with 35 deaths. The country has gone 74 days without any community transmission of the virus.

The pandemic has infected more than 54 million and killed more than 1.3 million people worldwide.