Dr. Katelyn Jetelina

Why we listen to Katelyn: she translates the week's public health data into plain, honest answers — including when the answer is "we don't know yet."

By day she wears many hats, including scientific consultant to a number of organizations, among them the CDC. At night she writes Your Local Epidemiologist, the newsletter that walks readers through outbreaks, vaccines, and health policy as the evidence develops.