The new patients were recorded in Ho Chi Minh City and the northern provinces of Bac Giang and Bac Ninh.
In Bac Giang, the 28 new cases are related to clusters at its industrial parks.
The 23 cases in HCMC are those who had had contact with previously confirmed patients.
Of the 19 cases in Bac Ninh, 14 are linked to clusters at two industrial parks, three are related to a hotspot in Dai Phuc Ward of Bac Ninh Town and one is associated with a previously confirmed Covid-19 patient. The source of transmission for another case is still unclear.
Seven weeks into the new wave, Vietnam has recorded local Covid-19 cases in 40 cities and provinces.
Bac Giang and Bac Ninh continued to suffer the highest number of infections, 4,194 and 1,379, followed by HCMC with 894.
Of the infected localities, 23 cities and provinces have gone for at least two weeks without recordcing any new cases.