ARUSHA, Tanzania — 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