Researchers believe personal stories are more persuasive than facts alone in addressing vaccine skepticism

When Nikki Hill Johnson’s first daughter was born in 2012, Johnson didn’t hesitate to take her to the doctor for routine infant immunizations.

Soon after the birth, South Carolina-based Johnson, now 42, joined a fitness- and nutrition-oriented multilevel marketing company (MLM). There, she encountered a colleague who made her question the safety of vaccines.