A man from the central Vietnamese city of Da Nang has tested positive for COVID-19 after completing a 28-day quarantine period, the municipal Department of Health confirmed on Tuesday.
The individual, who is a petroleum engineer, traveled from Ho Chi Minh City to Da Nang on June 13 to work at PVD 6 drilling rig, which belongs to the state-run Vietnam Oil and Gas Group.
Following his arrival, he was brought to Seven Sea Hotel on Vo Nguyen Giap Street for quarantine from June 13 to July 4.
He tested negative for the novel coronavirus four times during this period.
After the 21-day concentrated quarantine period, the man was required to self-quarantine for another seven days and decided to remain at the hotel.
He was tested for the fifth time at the end of the self-quarantine period on July 11 and the result also came back negative.
He moved to Petro Hotel on Quang Trung Street on Monday and signed up for another COVID-19 test on Tuesday before starting his job.
However, the result this time returned positive.
He has been taken to a local hospital for treatment and quarantine.
The man said he only had contact with a colleague following his quarantine period at Seven Sea Hotel, and that person was negative for COVID-19.
Vietnam had documented 36,605 COVID-19 cases as of Wednesday afternoon, with 9,553 recoveries and 130 deaths, according to the Ministry of Health.
The country has recorded 33,086 local infections in 58 provinces and cities, including 274 cases in Da Nang, since the fourth wave of transmissions began on April 27.