Mask up (again) and get vaccinated. Now is not the time to let up against covid.

The highly transmissible delta variant of the coronavirus has forced a return to face masks in some places. Despite the grim disappointment of what might appear to be a step backward, the nation’s pandemic response must not flag. Vaccines have proved to be extraordinarily effective in preventing severe disease and death, and there is no better solution at hand than getting millions more people vaccinated in the United States and the world. Face masks can restrain the spread of this virus. However, it is going to take longer than once hoped. We...