Like Ebola, the Marburg virus is believed to originate 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.

Eleven people have died in Rwanda as the African country continues to fight an outbreak of Marburg virus. The Rwandan government said there were 36 confirmed cases of the virus in its latest update, with 25 people in isolation.

Two people suspected of having the potentially lethal Marburg virus have tested negative, according to a Thursday statement from the city of Hamburg's social welfare office. They traveled to Germany from Rwanda.