Europe and Asia have so far avoided a significant resurgence of Covid-19 cases even though most countries have emerged from lockdown and restarted chunks of their economies, a possible sign the coronavirus pandemic can be held in check by less stringent means.

The preliminary evidence offers some hope to areas of the U.S. like New York City that are emerging from the lockdown, even as disease experts caution that the virus is far from defeated and the risk of a major new wave of infection remains. That caveat means some degree…

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