Both patients are linked to the fresh COVID-19 outbreak in Chi Linh city in northern Hai Duong province.
They are being treated at the National Hospital for Tropical Diseases No.2.
The national tally so far hit 1,819 cases, including 933 domestically infected while the remainder imported. The number of cases linked to the fresh outbreaks since January 27 totalled 240.
Meanwhile, 1,457 cases have been given the all-clear. The death toll remains at 35.
Among those still under treatment, nine have tested negative for the novel coronavirus once, four twice, and three thrice.
A total of 26,861 people who had close contact with COVID-19 patients or arrived from pandemic-affected areas are under quarantine across the country.
