Vietnam recorded on Wednesday one imported coronavirus case, a Vietnamese who had returned from Angola aboard the same flight as over a dozen other patients, according to the Ministry of Health.
The patient, 43, was quarantined upon entry into the country, the health ministry said.
He has a registered address in Ky Anh Town, north-central Ha Tinh Province.
The man landed at Van Don International Airport in northern Quang Ninh Province on board flight VN8 on October 20.
He was sent to a centralized quarantine center operated by the military in Bac Ninh Province, about 200km west of Quang Ninh, upon landing.
His third COVID-19 test returned positive on Tuesday. He is being isolated for treatment in Bac Ninh.
Thirteen other passengers aboard the flight VN8 had been confirmed as coronavirus cases, including 11 treated in northern Bac Giang Province and two in Bac Ninh.
Vietnam has confirmed 1,173 COVID-19 cases as of Wednesday night, including 1,062 recoveries and 35 deaths.
The country has gone 56 days without detecting any local transmission.
The Vietnamese government has warned of a resurgence of the virus in the coming winter-spring, as the pathogen has re-emerged in many countries around the world.
More than 44 million people have caught the novel coronavirus globally while over one million people have died from it.
Vietnam insists that people wear face masks in public, sanitize hands, keep a safe distance, avoid gatherings, and declare health status.
The country began denying entry to foreign nationals on March 22 but the government allows foreign experts, skilled workers, investors, and diplomats to enter the country on a case-by-case basis, subject to mandatory quarantine.
Though international commercial flights are now suspended, charter planes to the country have been arranged to bring in experts, skilled workers, and diplomats, and to repatriate Vietnamese citizens stranded in other nations and territories due to the pandemic.
Vietnam currently charges international arrivals for quarantine.
It provided the quarantine service for free in the past.