One of the two cases is a 49-year-old female farmer, residing in Son Loi commune, Binh Xuyen district, northern Vinh Phuc province. She is the mother of a 23-year-old female patient who had previously tested positive for the virus.

The other is her 16-year-old daughter and a younger sister of the female patient.

As both of them had close contact with the infected patient, so they have been closely monitored.

On February 4, local medical workers found that they showed symptoms of cough and tiredness. Both then were taken to the local medical station for quarantine and having samples tested.

The tests by the National Institute for Hygiene and Epidemiology indicated that they were positive for nCoV. They are now in stable health conditions.

The 23-year-old patient was one of eight people who returned from China’s Wuhan city on the same flight. Five of them were infected with the virus, while three others have been quarantined.

The eight Vietnamese people were sent to Wuhan for training by Nihon Plast Co Ltd of Japan and returned to Vietnam on China Southern Airlines fight CZ8315 on January 17.

The 12 coronavirus infection cases in Vietnam consist of two Chinese (a man and his son, with one already recovering), five Vietnamese returning from Wuhan, three people who had contact with one of the infected workers, one Vietnamese who is a hotel receptionist having close contact with the two infected Chinese nationals, and a Vietnamese American man who transited at an airport in Wuhan.

Le Ha

Wuhan coronavirus could negatively affect Vietnam's economy: Fitch

Vietnam last year received some 18 million foreign tourists, including 5.8 million Chinese guests.

Coronavirus: What it does to the body

Chinese doctors detail the impact the new coronavirus has on patients.

28,276 cases of 2019-nCoV infections confirmed as of Feb. 6

As many as 28,276 cases of 2019-nCoV infections have been reported as of 7.30am on February 6.