ARUSHA, Tanzania (AP) — The World Health Organization said Wednesday an outbreak of suspected Marburg disease has killed eight people in a remote part of northern Tanzania.

“We are aware of 9 cases so far, including 8 people who have died,” WHO chief Tedros Adhanom Ghebreyesus said in a statement. “We would expect further cases in coming days as disease surveillance improves.”

Like Ebola, the Marburg virus originates in fruit bats and spreads between people through close contact with the bodily fluids of infected individuals or with surfaces, such as contaminated bed sheets.

Without treatment, Marburg can be fatal in up to 88% of people who fall ill with the disease. Symptoms include fever, muscle pains, diarrhea, vomiting and in some cases death from extreme blood loss. There is no authorized vaccine or treatment for Marburg.

WHO said its risk assessment for the suspected outbreak in Tanzania is high at national and regional levels but low globally. There was no immediate comment from Tanzanian health authorities.

An outbreak of Marburg in Rwanda, first reported on Sept. 27, was declared over on Dec. 20. Rwandan officials reported a total of 15 deaths and 66 cases, with the majority of those affected healthcare workers who handled the first patients.

An outbreak in 2023 of Marburg in Kagera, which shares a border with Rwanda, killed at least five people.