By Thursday, those quarantined numbered 44,955, including nearly half in military-run centers, down about 15% from Monday's figure, official data showed, as many among the first influx to return home early in March were discharged.
"All passengers undergo quick screening," a medical official at Hanoi's Noi Bai airport told Reuters.
"Those with symptoms are taken to hospital, and the rest are sent to quarantine camps, where they will share a room with 10 to 20 others on the same flight."