Healthcare workers across New York City are bracing for a surge in COVID-19 patients who need hospital care. But they are already seeing shortages of supplies and staff as their colleagues test positive for the virus, and while patients displaying flu-like symptoms continue to crowd emergency rooms. “Everything is being rationed,” said one nurse in a Queens hospital whose floor was just converted to the first COVID-19 floor, and is now full with two dozen patients. “We went from donning and doffing gowns, only in the patient room, to being told we can wear the same gown in two positive-Corona...