Hanoi has launched contact-tracing measures and sampled all people exposed to a young man who tested positive for COVID-19 upon arriving in Japan last week.

The young man arrived in Japan on a flight from the Vietnamese capital and was subject to a rapid-result COVID-19 test, which came back positive.

Hanoi was informed of the man’s test result by the Japanese authorities on Saturday, said Nguyen Khac Hien, director of the municipal Department of Health.

However, Japan’s document sent to Hanoi did not include the man’s address.

The local health department had to utilize contact-tracing software to confirm that the man resides in Ba Vi District, Hanoi.

All those exposed to the Hanoi man have been sampled for COVID-19 testing, with all results coming back negative, Hien said.

This is the third case of a person arriving in Japan from Vietnam who has tested positive for COVID-19.

A female doctor, 30, was previously positive for the coronavirus via a rapid COVID-19 test in Japan, but a conclusive test using the more accurate real-time PCR technique found that she was negative.

Hien added that Hanoi has conducted real-time PCR tests on 90 percent of arrivals from Da Nang since July 15.

The central city recorded a local infection on July 25 after the country had gone 99 days without a community-based case.

Since then, 540 local infections have been reported in Vietnam, nearly 88 percent of which have been documented in Da Nang and neighboring Quang Nam Province.

Vietnam’s COVID-19 tally has hit 1,022 cases, with 588 recoveries and 27 deaths, as of Tuesday morning.

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