The Canadian Food Inspection Agency has confirmed the country's 15th case of mad cow disease in an animal from B.C.

The agency says no part of the seven-year-old cow's carcass entered the human food or animal feed systems.

An investigation into the cause of the disease is underway at the animal's birth farm.

The agency is tracing the animal's herd mates at the time of birth and examining possible sources of infection.

The agency says the age and location of the BSE-infected animal are consistent with previous cases detected in Canada through a national surveillance program.

In 1997, Canada banned the use of animal products in food for cattle because the products are considered the source of mad cow infections, but the agency says some cases pre-dating the new rules will continue to surface.