BREAKING NEWS: TOP HEADLINES DECEMBER 2024 ON ABC WORLD NEWS TONIGHT WITH DAVID MUIR

Good evening and welcome to ABC World News Tonight. This is David Muir, bringing you the most up-to-date headlines from around the globe.This evening's top story: A significant breakthrough in the effort to discover a cure for viral epidemic. Scientists at the NIH have made groundbreaking discoveries that could transform medicine as we know it. I