What can persuade wary Republicans to get the COVID vaccine?

Concerns that vaccine hesitancy might prevent the United States from ending the coronavirus pandemic have been prominent among public health experts since well before any COVID vaccines had been approved. While much of the attention in the early weeks of the rollout was on addressing skepticism among people of color, polls suggest that the biggest divide in vaccine acceptance is not along racial or economic lines but political lines.

A number of recent surveys have found that Republicans have the highest rate of vaccine hesitancy of any group. Half of...