The three newly-detected patients returned from Angola on flight VN8 on October 20.
Three patients were given the all-clear on October 22, bringing the total number of recovered patients to 1,049. The fatalities remain at 35.
Among the active patients, seven have tested negative for the coronavirus SARS-CoV-2 once, five twice, and 11 thrice. There are no patients in critical conditions.
More than 13,650 people who had close contact with COVID-19 patients or came from pandemic-hit areas are now being quarantined nationwide
The Health Ministry said the risk of COVID-19 entering the country remains high with more flights bringing Vietnamese citizens and foreign experts home. It urged continued strict implementation of epidemic prevention measures.