Will door-to-door ‘vaccine missionaries’ win any converts?

They walk in pairs through neighborhoods, sharing their message door to door. Most are unpaid; they signed up for this work because they believe in it. Their training focuses on how to deal with tough questions and tough conversations — and while some people listen, many slam the door.

These public health volunteers proselytize about the COVID-19 vaccine, not religion. Their methods, though, resemble what door-to-door evangelists have done for decades. And as many Americans continue to be hesitant about receiving the vaccine, President Joe Biden hopes door-to-door corps can...