The disease can be spread by touch from cows to humans.

Transfer factor from cows seems to be safe in children when given by mouth for up to six months.

How might the disease cross the barrier from cows to humans?

The people had died because they ate meat from infected cows.

Transfer factors that are taken from cows seem to be safe when used short-term, up to three months.

First, it had to be capable of being transmitted from cows to humans.

The agreement applies only to beef products from cows younger than 20 months.

The chemical composition of the fat from cows that eat no grain is different.

Could the disease be spreading from cows to people?

Farmers who try to pass off milk from sick cows are punished.