The new patients were recorded in five northern localities of Bac Giang, Bac Ninh, Hanoi, Lang Son and Ha Nam.
In Bac Giang, 45 cases are related to the cluster at Quang Chau Industrial Park. The number of cases in this northern province that borders Hanoi crossed 1,000 on Monday night and currently stays at 1,069.
Hanoi recorded four cases: three have had contact with a Covid-19 patient and one is a medic at Bac Thang Long Hospital in Dong An District and has been isolated before testing positive.
Lang Son also registered four cases who are all workers at Quang Chau IP.
Ha Nam reported two cases linked to a hotspot in Cong Ly Commune of Ly Nhan District.
With the updated cases, Vietnam has recorded 2,406 cases in 30 cities and provinces so far in the new wave that started almost a month ago.
Bac Giang has the highest infection, followed by its neighbor Bac Ninh with 507 cases and Hanoi with 308 cases, including 137 in two hospitals under lockdown.