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Lockdowns a crude tool for nations to fight Covid-19 but they are justified

Without excellent testing and tracing, it takes a very strict lockdown to get numbers falling, whereas achieving explosive growth in cases is very easy

Ulubari flyover wears a deserted look during the weekend lockdown to curb Covid-19 spread, in Guwahati (PTI Photo)
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Based on their modeling, advisers to the U.K. government in September advised a short circuit-breaker lockdown, which the government decided against.

Mark Buchanan | Bloomberg Opinion
As the coronavirus pandemic continues its sweep through the U.S., India and Brazil, the dreaded second wave is now gathering strength in nations that had once contained the virus. Numbers are rocketing upward, especially in Europe, even as winter approaches, which will bring the added burden of seasonal illnesses such as influenza. Attempting to tamp things down, and to avoid overwhelming their health services, authorities in France, Germany and the U.K. are now considering stronger social distancing measures, with others — including in Ireland and Israel — ordering short, strict “circuit breaker” lockdowns.

Yet if anything is as ineradicable as