Approximately 1,000 people in Nghe An province are known to have received medical treatment at Bach Mai Hospital in Hanoi between March 10 and 24.
With roughly 300 people showing no symptoms of the virus after going over 14 days since returning from the hospital, authorities made the decision not to test them.
As a result, the provincial health sector only took samples from the other 700 cases, with each of the results ultimately coming back negative for the COVID-19 on April 11.
Currently there are 58 cases of people who recently returned from Bach Mai Hospital being isolated at their residence in Nghe An province, with a further 10 cases in concentrated isolation zones, and an additional 34 cases being put into isolation in hospital.
At present the provincial health sector has been able to take samples from 4,335 cases, with more than half testing negative for the virus whilst the remaining cases are currently waiting to receive their results.
In order to combat the COVID-19, medical workers plan on taking samples from 1,000 individuals currently in concentrated isolation zones locally.