Some countries might want to reconsider easing restrictions. Are you listening Mr Trump?
Coronavirus lockdown: Lessons from Hokkaido's second wave of infections
It was once seen as something of a success story - a region that worked to contain, trace and isolate the virus - leading to a huge drop in numbers. But Hokkaido is in the spotlight again as it struggles to deal with a second wave of infections.
In late February, Hokkaido became the first place in Japan to declare a state of emergency due to Covid-19.
Schools were closed, large-scale gatherings cancelled and people "encouraged" to stay at home. The local government pursued the virus with determination - aggressively tracing and isolating anyone who'd had contact with victims.
The policy worked and by mid-March the number of new cases had fallen back to one or two a day. On 19 March the state of emergency was lifted, and at the beginning of April, schools re-opened.
But now, just 26 days after the state of emergency was lifted, a new one has had to be imposed.
Hokkaido has acted independently of the central government, which placed Tokyo, Osaka and five other prefectures under a state of emergency last week. A nationwide state of emergency is expected to be announced on Friday.
Almost a success story
In the last week, Hokkaido has recorded 135 new confirmed cases of Covid-19. Unlike the first outbreak in February, there is no evidence the virus has been re-imported from outside Japan.
None of the new cases are foreigners, nor have any of those infected travelled outside Japan in the last month.
What does this tell us about how the virus outbreak was handled in Hokkaido?
Firstly, if you get on top of it really early, you can get it under control.
"It is relatively easy to tackle clusters, to contact trace and isolate," says Professor Kenji Shibuya of King's College London.
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