At least 12 people have been killed in an outbreak of Marburg virus in Rwanda, it has been confirmed, as health officials in the East African country have vowed to begin a vaccine study into the hemorrhagic fever to stop its spread.

Rwanda is currently grappling with an outbreak of the deadly Marburg virus. According to the health ministry, the death toll has risen to 11, with at least 36 confirmed cases.

Health officials in Rwanda are dealing with the country’s first outbreak of the Marburg virus, an Ebola-like disease which, if left untreated, has a fatality rate of up to 88%.