All 152 people in close contact with a Japanese man who had been diagnosed with COVID-19 received negative results for the novel coronavirus on Wednesday morning, according to Vietnamese health authorities.
The negative cases had been confirmed via the real-time PCR method, which is widely used to detect COVID-19 infections.
The confirmed Japanese patient is T.K., 33, who lived in the five-star hotel Roygent Parks and works for a company in Thuy Nguyen District, Hai Phong, a port city in northern Vietnam, the local Department of Health said.
K. flew to Japan on an Asiana Airlines flight coded OZ 112 on Monday and landed in Osaka at 10:10 am the same day.
While he was in Hai Phong, the Japanese man traveled on the same shuttle bus as 13 others and a driver of T.T. Company from home to his workplace.
Before leaving for Japan, K. participated in a farewell party with his colleagues.
Vietnamese health workers searched for people who had come into direct contact with K. to send them to quarantine areas and take samples for testing as per regulations.
The city’s Department of Health joined hands with sanitary units to fumigate the houses and workplaces of the suspected cases.
With no infection reported as of Wednesday morning, Vietnam's COVID-19 tally now stands at 1,098 with 35 reported deaths.
The country has recorded no community transmission for over a month.