Childhood vaccination rates against measles have fallen below the threshold needed to prevent community outbreaks in three-quarters of U.S. counties with recent data, according to an NBC News investigation. The decline coincides with 43 outbreaks and more than 5,000 confirmed cases nationwide this y ear, according to the Centers for Disease Control and Prevention. Eight people […] Measles Defense Collapses Across US As Outbreaks Surge And Immunity Lapses ...read more read less