Two patients returned to Khanh Hoa from Russia and three others came back to Da Nang from Japan on different flights on April 18 and April 7, respectively, the MoH said in its 18.00hrs update.
All the returnees were placed in quarantine upon their arrival and they all tested positive during their stay in concentrated quarantine facilities.
Vietnam has brought under control the recent coronavirus outbreak after the virus recurred in Hai Duong province three months ago. No new locally transmitted cases have been detected during the past few weeks.
However, relevant agencies have constantly confirmed infections returning from epidemic hit countries like the US, Russia, Japan, the Republic of Korea, the Philippines and India.
Vietnam has so far recorded 2,806 coronavirus cases, including 2,490 recoveries.
The number of deaths caused vby COVID-19 and related illnesses remains at 35.