It’s been almost a year since the World Health Organization declared the coronavirus outbreak a pandemic. And the virus is persisting: A downward trend in the U.S. caseload has stalled, and concern about the impact of variants is growing. Yet inoculations are on the rise, and the F.D.A. has approved Johnson & Johnson’s single-dose vaccine, the third to be approved in the U.S. Today, we check in on the latest about the coronavirus.