The WHO counts over 60 separate health emergencies this year, all overshadowed by the novel coronavirus.
The study, carried out in a joint effort by British and Guinean scientists, is the world's largest and most comprehensive one to date to examine survivors of the Ebola virus.
"The virus is spreading across a wide and rugged terrain which requires costly interventions."
An epidemic of the virus on the other side of the country has killed more than 2,200 people since 2018.
On April 17, a 28-year-old motorbike taxi-driver who had tested positive for Ebola ran away from the centre where he was being treated in the town of Beni.
Ebola causes fever, bleeding, vomiting and diarrhea and spreads among humans through bodily fluids. The current outbreak has killed about two thirds of those it infected.
Everyone can help to fight the novel coronavirus pneumonia.
Viral studies have become rampant lately, as new species of human viruses are constantly being identified.
Several of ADF's attacks have been claimed by Islamic State, but the extent of their relationship remains unclear.
A recent outbreak in West Africa killed over 11,000 people.