With @WHO's support, @MinofHealthUG has started a vaccine trial against #Ebola Sudan virus today. The trial will enroll contacts of people with the disease, and contacts of the contacts. This vaccination trial was initiated with record speed, only three days since the outbreak was declared, while ensuring full compliance with international and national regulatory and ethical requirements. It is also the first trial to assess the clinical efficacy of a vaccine against Ebola Sudan virus disease. This trial demonstrates the importance of investing in R&D for vaccines and treatments and outbreak response preparedness, as well as partnerships. We thank @Makerere University and @UVRIug for their leadership, as well as @AfricaCDC, @CEPIvaccines, @EC_HERA and @IDRC_CRDI for their collaboration on this lifesaving effort. WHO will continue supporting the government in a comprehensive response to bring the outbreak under control.