Ho Chi Minh City led with 7,308 cases, followed by Binh Duong (3,172) and Dong Nai (814).
Hanoi recorded 40 new cases.
The new cases brings the Covid-19 tally since the beginning of last year to 563,676.
335 deaths were confirmed Wednesday, raising the death toll to 14,135, or 2.5 percent of infections.
13,937 patients were discharged Wednesday, bring the tally to 325,647.
Vietnam has given 23.57 million vaccine doses, in which 3.77 million people have received two doses.
HCMC and Hanoi are still rushing the wide testing of its citizens.