The World Health Organization has declared the Ebola crisis in the Democratic Republic of Congo as an international emergency.
Health officials say the outbreak has killed more than 1,600 people so far.
They say it could spread to neighbouring countries like Uganda if it's not contained quickly.
However they have not ordered the closing of any borders.
The first case was detected in the city of Goma, which is home to more than a million people.

Strike hits Beirut apartment block as Israel presses attacks
Six killed in Swiss bus blaze after person reportedly sets themselves on fire
Thailand's Phuket airport closes runway after Air India Express plane malfunction
Released UK files reveal concerns on Mandelson's appointment by Starmer
US says it destroyed mine-laying vessels as Trump warns Iran over strait
Britain working with allies to support shipping through Strait of Hormuz
Wildlife to replace humans on next series of UK banknotes
Five Iranian women's soccer players granted humanitarian visas in Australia
