KIRKLAND, Wash.—Francis Riedo was working late in his office at EvergreenHealth hospital the night of Feb. 28 when a colleague at the Seattle & King County public health department called with alarming news: Two elderly patients whom Dr. Riedo had picked to test for the new coronavirus were positive. Dr. Riedo hurried to the I.C.U. and gathered the nurses.

“This is going to change your lives,” the doctor told them.

Twenty…

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