PITTSBURGH—Every afternoon, Larry Levine, 94, took the bus 2½ miles from his senior-care apartment to visit his wife of 70 years, Claire Levine, who has Alzheimer’s. He usually brought flowers and stayed for dinner at the memory-care community where she lives. His visits have stopped.

Twelve days ago, Mrs. Levine’s residence banned all visitors to protect them from the new coronavirus sweeping the country.

That…

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