Unused Vaccines Are Piling Up Across U.S. as Some Regions Resist

Many U.S. states and cities have a growing surplus of Covid-19 vaccines, a sign that in some places demand is slowing before a large percentage of the population has been inoculated, according to an analysis by Bloomberg News.

The data indicate as many as one in three doses are unused in some states. Appointments for shots often go untaken, with few people signing up.

Bloomberg analyzed state and U.S. data from Monday, providing a snapshot of vaccine use before Johnson & Johnson shelved millions of shots pending federal health officials’ investigation into rare cases of blood clots. That pause will likely cause the number ...