The Ministry of Health recorded on Tuesday ten imported coronavirus cases who were quarantined upon entry into Vietnam from Russia and Angola.
Eight of the new patients are Vietnamese repatriates from Russia.
They landed at Van Don International Airport in northern Quang Ninh Province on board flight VN5062 on October 31.
They were sent to a collective quarantine center in Hung Yen Province, about 180km west of Quang Ninh, on arrival.
The Hung Yen Center for Disease Control confirmed their COVID-19 infection on Monday.
The patients are being isolated for treatment at the Dong Anh branch of the National Hospital for Tropical Diseases in Hanoi.
The remaining two patients, also Vietnamese, entered Vietnam from Angola aboard flight VN8.
They were taken to a military-managed quarantine center in Bac Ninh Province, around 200km west of Quang Ninh, immediately when they touched down at the Van Don airport on October 20.
Their second coronavirus tests returned positive at the Bac Ninh Center for Disease Control on Monday.
The two patients are being treated at Bac Ninh General Hospital.
The health ministry announced four recoveries on Tuesday, taking Vietnam’s number of recovered patients to 1,065.
The Southeast Asian country has confirmed 1,202 coronavirus patients as of Tuesday night, with 35 virus-related deaths.
It has documented no community transmission for over two months.
Vietnam began denying entry to foreign nationals on March 22 but the government allows foreign experts, skilled workers, investors, and diplomats to enter the country on a case-by-case basis, subject to mandatory quarantine.
Though international commercial flights are now suspended, charter planes to the country have been arranged to bring in experts, skilled workers, and diplomats, and to repatriate Vietnamese citizens stranded in other nations and territories due to the pandemic.
Vietnam currently charges international arrivals for quarantine.
It provided the quarantine service for free in the past.