One of the two cases is a 49-year-old female farmer, residing in Sơn Lợi commune, Bình Xuyên 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 the younger sister of the female patient. On February 4, local medical workers found that they showed symptoms of cough and tiredness. Both were then taken to the local medical station for quarantine and to get tested. The tests of the National Institute for Hygiene and Epidemiology indicated that they were positive for nCoV. They are now in stable condition. The 23-year-old patient was one of eight people who returned from Wuhan, China on the same flight. Five of them have been infected with the virus, while three others have been quarantined.