Among the new cases, three were found among those who returned abroad and have been under quarantine immediately after their entry. Another patient is a Danish tourist, who arrived in Hanoi on March 7. She has traveled to Ha Giang, Hue, Hoi An and stayed at various hotels. The remaining two patients are staff members supplying hot water at Bach Mai hospital. Those two cases were found positive after tests were conducted on nearly 5,000 staff members, patients and patients’ carers at the hospital following the discovery of several Covid-19 cases among medical workers and patients there. After investigation, the Health Ministry said there is a possibility that there is a source of infection among patients’ caretakers who brought the virus from outside. The hospital has temporary closed down for quarantine.