55 cases were recorded in the northern province of Bac Giang, four in its neighbor Bac Ninh, five in Lang Son and one in Hanoi's locked down National Hospital for Tropical Diseases.
All the cases in Bac Giang and Bac Ninh are associated with existing clusters in the two provinces' industrial parks.
Six cases in HCMC are linked to a Christian congregation Covid-19 cluster that emerged in Go Vap District three weeks ago, while three others have had close contact with confirmed coronavirus cases. The infection source of the other case is still unknown.
All the cases in Lang Son had made contact with confirmed Covid-19 patients.
The case in Hanoi is a medical worker who treats Covid-19 patients inside the locked down hospital.
Since the latest Covid-19 wave started six weeks ago, 5,951 cases have been recorded in 39 cities and provinces across Vietnam, including 3,288 in Bac Giang and 1,132 in Bac Ninh.
With the Tuesday noon tally, HCMC has surpassed Hanoi to become the locality with the third highest number of local Covid-19 infections during Vietnam's latest coronavirus wave at 447 cases. Hanoi now has 439, including 95 at the locked down hospital.