A rare, highly contagious Ebola-like virus has claimed eight lives in Rwanda, and U.S. health officials are closely monitoring the outbreak. Marburg virus causes a rare hemorrhagic fever that has no authorized vaccine or treatment.

The deadly Marburg virus is believed to originate in fruit bats and spreads between people through close contact.

Rwanda says eight people have died so far from the Ebola-like and highly contagious Marburg virus, just days after the country declared an outbreak of the deadly hemorrhagic fever that has no authorized vaccine or treatment.