Eastern Congo marked an official end Thursday to the second deadliest Ebola outbreak in history, which killed 2,280 people over nearly two years, as armed rebels and community mistrust undermined the promise of new vaccines. Thursday’s milestone was overshadowed, though, by the enormous health challenges still facing Congo: the world’s largest measles epidemic, the rising threat of COVID-19 and another new Ebola outbreak in the north. “We are extremely proud to have been able to be victorious over an epidemic that lasted such a long time,” said Dr. Jean-Jacques Muyembe, who coordinated the national Ebola response and whose team also developed a new treatment for the once incurable hemorrhagic disease.