HANOI - Vietnam reported two more coronavirus cases on Tuesday linked to a rare domestic infection in its commercial hub Ho Chi Minh City, while the government urged public vigilance and tighter enforcement of health measures.

The Southeast Asian nation is back on high alert after confirming on Monday the country's first community infection in 89 days, prompting the closure of several places in the densely-populated southern city. 

The latest cases have been traced back to a flight attendant, who had been kept inside a quarantine facility for five days before being released to self-isolate at home.

"The flight attendant contracted the virus inside the quarantine area then spread it to others during his home-quarantine time," health minister, Nguyen Thanh Long, said in a government statement.

"It's the first ever time such thing happened. The flight attendant seriously violated quarantine regulations," he added.

With its usually strict quarantine and tracking measures, Vietnam has managed to quickly contain its coronavirus outbreaks, allowing it to resume its economic activities earlier than much of Asia.

Vietnam crushed its first wave of coronavirus infections in April and went nearly 100 days without local transmission until the virus remerged in the central tourist city of Danang in July and spread widely, before being contained in a few weeks.

Prime Minister Nguyen Xuan Phuc asked citizens and authorities to step up measures to guard against the spread of coronavirus, especially ahead of the Communist Party's five-yearly congress.

"There will be many big gathering events ahead the National Congress, our country's biggest political event, we can't let the virus affect us."

Vietnam has registered a total of 1,349 coronavirus cases altogether, with 35 deaths.

(Reporting by Phuong Nguyen; Editing by Martin Petty) ((haphuong.nguyen@thomsonreuters.com; +84-24-3852-9623;))