The Japanese authorities understood covid-19 better than most

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WHEN THE Diamond Princess, a cruise ship suffering from an outbreak of covid-19, arrived in Japan in February, it seemed like a stroke of bad luck. A small floating petri dish threatened to turn the Japanese archipelago into a big one. In retrospect, however, the early exposure taught the authorities lessons that have helped make Japan’s epidemic the mildest among the world’s big economies, despite a recent surge in infections. In total 2,487 people have died of the coronavirus in Japan, just over half the number in China and fewer people than on a single day in America several times over the past week. Japan has suffered just 18 deaths per million people, a higher rate than in China, but by far the lowest in the G7, a club of big, industrialised democracies. (Germany comes in second, at 239.) Most strikingly, Japan has achieved this success without strict lockdowns or mass testing—the main weapons in the battle against covid-19 elsewhere.