Government Chief Medical Officer Dr. Brima Kargbo confirmed on Sunday that a fifth doctor has tested positive. The other four all have died from the virus that has killed nearly 5,000 across West Africa.
The sick physician has been identified as Dr. Godfrey George, medical superintendent of Kambia Government Hospital in northern Sierra Leone. He was driven to the capital of Freetown after reporting he wasn't feeling well.
Doctors and nurses have been the most vulnerable to contracting Ebola, as the virus spread through bodily fluids. Some 523 health workers have contracted Ebola, and about half of them have died.