As a Florida elementary school tries to contain a growing measles outbreak, the state’s top health official is giving advice that runs counter to science and may leave unvaccinated children at risk of contracting one of the most contagious pathogens on Earth, clinicians and public health experts said. Florida surgeon general Joseph A. Ladapo failed to urge parents to vaccinate their children or keep unvaccinated students home from school as a precaution in a letter to parents at the Fort Lauderdale-area school this week following six confirmed measles cases. Instead of following what he acknowledged was the “normal” recommendation that...