Vaccine Refusal May Put Herd Immunity At Risk, Researchers Warn

Joyce Ann Kraner is eager for the pandemic to end and for life to get back to normal. Kraner, 49, wants to be able to hug her mother, who lives in a nursing home.

But she says she has no plans to get the vaccine, even though it's widely available in her community of Murfreesboro, Tenn. "I feel like I'm healthy," she says.

Despite the fact that millions of people have been vaccinated safely, Kraner worries about complications. She believes some people are having "life-threatening reactions" to the vaccine that...