The need for coronavirus vaccines has never been greater: The U.S. has surpassed 25 million known cases, and more contagious variants threaten to erase recent gains made in curbing the spread of the virus.

And yet the reality on the ground is growing more confusing by the day. Health officials around the country are growing desperate, unable to get clear answers as to why the long-anticipated vaccines are suddenly in short supply. Many vaccine appointments have been canceled. Above, a mass vaccination site in Glendale, Ariz.

The Biden administration has pledged to overhaul how doses are distributed to states, but vaccine experts warn that shortages will persist in the short term. See how your state is doing with vaccine distribution compared to others.

As wealthier nations (and people) get first dibs, new research shows that if poor countries go unvaccinated, rich ones will pay the economic price.
The New York Times