A woman who recently travelled in West Africa has tested negative for the Ebola virus, a Toronto hospital confirmed Wednesday night.

The patient, who has not been identified, was being assessed at Sunnybrook Health Sciences Centre. She was admitted earlier in the day with a fever and nausea -- early symptoms of the disease, but they are also symptoms of many other ailments.

Dr. Andrew Simor, an infectious disease expert at Sunnybrook, said the woman had been in Guinea. The hospital believes she left the country more than 21 days ago. The incubation period for Ebola is between two to 21 days.

Earlier this month, the World Health Organization said the Ebola outbreak has killed more than 10,000 people, mostly in the West African nations of Guinea, Liberia and Sierra Leone. A total of more than a dozen Ebola deaths have also occurred in the United States, Mali and Nigeria.

Canada has never had an Ebola case diagnosed with its borders.

Canada's chief medical officer Dr. Gregory Taylor has previously said the risk of the disease in the country "remains very low." He said the country is well prepared to protect Canadians against an outbreak.

With files from The Canadian Press