Global surge in coronavirus cases is being fed by the developing world — and the U.S.

The novel coronavirus — once concentrated in specific cities or countries — has now crept into virtually every corner of the globe and is wreaking havoc in multiple major regions at once. But the impact is not being felt evenly. Poorer nations throughout Latin America, the Middle East, South Asia and Africa are bearing a growing share of the caseload, even as wealthier countries in Western Europe and East Asia enjoy a relative respite after having beaten back the worst effects through rigorously enforced lockdowns.