The World Health Organization (WHO) convened an “urgent meeting” this week amid an outbreak of the Marburg virus, which causes one of the world’s deadliest diseases, in Africa.

Health officials say Marburg, first seen in the late 1960s, is related to Ebola. However, WHO officials say it’s far more deadly, killing upwards of 88 percent of people who contract it.

The virus has been detected in several African countries over the past several months, including recently in Equatorial Guinea. A small number of Marburg cases were found in Ghana late last year.

“WHO on Tuesday convened an urgent meeting of the Marburg virus vaccine consortium (MARVAC) to discuss the outbreak,” a news release from the United Nations-backed health agency said on Tuesday, adding that Equatorial Guinea has confirmed its first-ever case of the virus. WHO officials say the virus is responsible for nine deaths in the tiny African nation.

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