The new cases were recorded in 4 northern provinces of Bac Giang (15), Dien Bien (6) Hai Duong (2) and Bac Ninh (1).
13 cases in Bac Giang are linked to a cluster at its Quang Chau Industrial Park. The other cases are in areas that have been isolated.
The cases Dien Bien had contact with COVID-19 patients.
The cases in Hai Duong are associated with a new hotspot in the province.
The case in Bac Ninh had contact with a COVID-19 patient.
Bac Giang has recorded the highest number of infections in the country, at 683, since COVID-19 re-emerged in the country on April 27.
Vietnam has so far detected 4,833 cases with 2,689 recoveries and 39 deaths.
