By James Gallagher
Health and science correspondent, BBC News
The world is entering "a new phase" where big outbreaks of deadly diseases like Ebola are a "new normal", the World Health Organization has warned.
Previous Ebola outbreaks affected relatively small numbers of people.
But the Democratic Republic of Congo is dealing with the second largest outbreak ever, just three years after the world's largest one ended.
The WHO said countries and other bodies needed to focus on preparing for new deadly epidemics.
What is Ebola?
- Ebola is a virus that initially causes sudden fever, intense weakness, muscle pain and a sore throat.
- It progresses to vomiting, diarrhoea and both internal and external bleeding.
- People are infected when they have direct contact through broken skin, or the mouth and nose, with the blood, vomit, faeces or bodily fluids of someone with Ebola.
- Patients tend to die from dehydration and multiple organ failure.