OTTAWA - Canada is not yet following the U.S. and warning citizens not to travel to Liberia, Guinea and Sierra Leone.

But the Public Health Agency of Canada has issued a travel health notice about the Ebola outbreak in three African countries.

It notes that dozens of cases of the deadly disease have been reported in those countries and that Nigeria has reported its first death due to the virus.

Ebola has killed more than 700 people this year, but the U.S. Centers for Disease Control says the risk of it coming to the United States remains small.

However, U.S. health officials warned Americans not to travel to the three West African countries hit by the worst recorded Ebola outbreak in history.

The current outbreak is the largest since the disease first emerged in Africa nearly 40 years ago.

The contagious virus is spread by direct contact with blood or bodily fluids from a sick person and can't be spread like flu through casual contact or breathing the same air.

There is no vaccine and no specific treatment for the contagious virus.