America is running short on masks, gowns and gloves. Again.

Health-care workers on the front lines of the coronavirus pandemic are encountering shortages of masks, gowns, face shields and gloves — a frustrating recurrence of a struggle that haunted the first months of the crisis. Nurses say they are reusing N95 masks for days and even weeks at a time. Doctors say they can’t reopen offices because they lack personal protective equipment.