The World Health Organization (WHO) has announced the beginning of the first clinical trial of an Ebola vaccine in the outbreak that started in the Democratic Republic of Congo (DRC). WHO’s director-general, Tedros Adhanom Ghebreyesus, said in a social media post on Friday that participants in the trial were vaccinated with the Ervebo vaccine in Bunia, the capital of the DRC’s northeastern Ituri province, which is the epicentre of the Ebola outbreak.