On 17 October 2017, the Ugandan Ministry of Health notified WHO of a confirmed Marburg outbreak of Marburg Virus disease (MVD) in Kween district, Eastern Uganda. The outbreak was officially declared by the Ministry of health on 19 October 2017. As of 7 November, four cases of MVD have been reported- two confirmed (dead), one probable (dead) and one suspected. Other patients, previously reported as suspected cases, have since tested negative for the virus. WHO has been implementing the Emergency Response Plan since 20 October 2017 when the Ministry of Health officially declared the outbreak. The Emergency Response Plan was developed on several assumptions which may now need to be revised.