Two new patients are flight attendants on a repatriation flight from Russia, while two others were repatriated citizens on a similar flight from the US. All were quarantined upon arrival.
"Patient 321" and "patient 322", 44 and 39 years old, are residents in Phu Nhuan District, Ho Chi Minh city.
The male flight attendants worked on flight VN0062 from Russia that landed on Van Don Airport in the northern province of Quang Ninh on May 13.
After completing the medical clearance and migration procedures, the entire cabin crew flew to Hanoi. At 10 a.m. on the same day, the crew departed on a flight with no passengers from Hanoi to HCM ciity.
They were isolated at the residence of Vietnam Airlines in Tan Binh District after landing.
The two shared a room together. The following day, both were tested for the first time but the results came out negative. Two days later, "patient 321" had a fever. On Sunday, the results of his second test came out positive.
After "patient 321" had a fever, "patient 322" was isolated in another room. His positive results came out the day after.
The two are currently being treated in the Cu Chi field hospital, HCMC.
"Patient 323", a 19-year-old woman and "Patient 324", a 18-year-old man, are residents in Tan Binh District, HCMC. The two are returning students from the US on flight VN001 to Noi Bai Airport in Hanoi on Saturday. Their seats were 41D and 27K respectively.
The two were quarantined at the National Center for Security and Security Education in Hanoi National University in Thach That District, Hanoi, upon arrival. They were tested positive on Sunday and are currently under treatment at the National Hospital for Tropical Diseases.
On Monday, three Vietnamese patients were declared free of the novel coronavirus in Hanoi.
Vietnam has recorded 324 Covid-19 cases to date, of these 184 were imported. In total, 263 have recovered after treatment. No deaths have been recorded so far.
There has been no community transmission for over a month.