About 300 people walking in the city and another 300 at local schools were given saliva-based polymerase chain reaction (PCR) tests.
Compared to mass-testing drives in South Korea, China and other nations, it was a small effort. But for Japan, the testing exercise - set to be replicated in many parts of the country - represents a significant step up.
Concerned by highly transmissible variants of the virus and asymptomatic spread, Japan revised its pandemic strategy in early February, and the new testing comes as many regions emerge from a two-month state of emergency and Tokyo prepares to host the Olympics from July.
However, many health experts argue the updated strategy still falls far short of what is needed, especially given that inoculations have only just started and vaccine supplies are limited. The health ministry's policy of eschewing mass-testing to conserve manpower and hospital resources is "upside down and totally wrong", says Yusuke Nakamura, a renowned geneticist and cancer researcher.
He believes Japan has squandered opportunities to drive down infections to zero with extensive PCR testing and should be investing heavily in automated PCR testing systems.
The government conducts around 40,000 PCR tests a day, about a quarter of its capacity, restricting tests to people who are symptomatic or who have had a high chance of being infected. Over the course of the pandemic, it has performed about 60 COVID-19 tests per 1,000 people, compared with 130 in South Korea or 1,000 in the United States, according to the Our World in Data website run by an Oxford University research programme.
Instead, Japan has concentrated on busting up clusters by tracing their sources, with the health ministry defending its COVID-19 testing regime as in line with standards set by the World Health Organization.
To be fair, that policy combined with instructions to the public to avoid crowded and poorly ventilated places as well as widespread mask-wearing, had been relatively successful in containing the virus until a surge in infections early this year.
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