By Drew Hinshaw and Natalia Ojewska

WARSAW—A second wave of Covid-19 cases in Europe is tearing into countries that escaped the first, with health systems running short of the one resource they can’t run without: staff.

One of Poland’s largest hospitals, in the city of Krakow, installed enough beds and ventilators to treat a surge of Covid-19 patients, but has started to run out of workers in recent weeks as the number of national cases has doubled roughly every three days. Orthopedists, urologists, surgeons, neurosurgeons and gynecologists have donned scrubs to help treat those sick with the coronavirus.

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