Of them, 57 cases were recorded in HCMC, 10 in its neighbor Binh Duong Province, five in the central Binh Thuan Province, two in Central Highlands Gia Lai Province, and one each in the northern Quang Ninh and Bac Giang provinces, Hai Phong City, the central Khanh Hoa Province, and the southern Long An Province.

Most of the cases in HCMC are linked to clusters that have just emerged in the past few days, including 19 related to a cluster at Binh Dien wholesale market in District 8, 14 related to a cluster at Ngoc Ha clothing shop in District 1, six associated with a cluster at Son Ky market in Tan Phu District.

Among the remaining cases in the city, 10 had had direct contact with previously confirmed patients and the transmission source of another eight is still unidentified.

In Binh Duong, three cases are linked to a cluster at Vietnam Housewares Co.Ltd in Thuan An Town, four to a cluster at Hien Hoa Anh Ceramics Company in Tan Uyen Town, one had contacted a Covid-19 patient and two have undetermined source of transmissions.

The cases in Binh Thuan Province are a 38-year-old doctor at Binh Thuan General Hospital and her four family members. The authorities are looking into their sources of infection.

Two cases in Gia Lai returned home from hotspot Binh Duong and have been isolated prior to their positive test results.

The case in Khanh Hoa is a seven-year-old boy in Cam Ranh Town who has made contact with a coronavirus case.

Two cases in Long An and Hai Phong have both contracted the virus after having contact with previously confirmed patients.

The case in Quang Ninh is a 24-year-old man from the central province of Quang Nam, who had had contact with a previously confirmed patient.

The case in Bac Giang is a 38-year-old man from the Central Highlands' Da Lat Town who is being contact traced.

The country's ongoing Covid-19 wave, the fourth and by far the most challenging, started on April 27 and has seen infections in 47 of its 63 cities and provinces.

With the new updates, Binh Thuan has recorded the very first cases so far in this wave while community transmissions have returned to Quang Ninh after 45 days and Hai Phong after 20 days.

Bac Giang continued to suffer the highest number of infections at 5,528, followed by HCMC with 2,293.

The country has administered nearly three million Covid-19 vaccine shots since early March, with 143,121 people fully vaccinated with two doses.