Businesses from factories and offices to salons and bars, once hopeful about a smooth reopening this summer, are now grappling with whether to close, stay open or find some in between as the growth of cases of Covid-19 mounts in dozens of states.

Apple Inc., which Friday said it would close nearly a dozen stores in four states, on Wednesday said it would shut seven more in the Houston area, where cases have doubled so far this month. Restaurants around the country that recently reopened have closed again for anywhere from…

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