OTTAWA - Another case of mad cow disease has been found in B.C., the third in the last three years in the province and the thirteenth across the country.

The Canadian Food Inspection Agency isn't saying where the infected cow is located but an investigation is under way to determine where the cow was born.

Mad cow disease is also known as bovine spongiform encephalopathy, or BSE.

The inspection agency says a ban on using animal materials in feed products has virtually eliminated the spread of BSE in Canada, but it says a small number of mad cow cases are still expected to surface.

In 2006 and 2007 the disease was found in two B.C. dairy cows, and in both cases the Canadian Food Inspection Agency said the infection was caused by contaminated feed.

It also said there was no risk to public health because no part of the animal entered the human food systems.