1.   Because the cause of mad cow disease seems rooted in contaminated feed, cases have been found on small farms as well as large industrialized farms.

2.   Agriculture officials say the Belgian sheep could have caught the disease by eating contaminated feed while they were still in Belgium.

3.   Contaminated feed, dirty sheds and the use of antibiotics may all add to the risk of disease.

4.   France already has a ban on such feed for cows, as experts believe the disease is transmitted through contaminated feed.

5.   Mad cow disease does not seem to be communicable among cattle except through contaminated feed.

6.   The U.S. Food and Drug Administration today told producers not to distribute catfish and egg products made from animals that may have eaten contaminated feed.

7.   Tyson said in a statement that it had stopped using the potentially contaminated feed in June when it came under suspicion.

8.   Bovine spongiform encephalopathy, or mad cow disease, is believed to have been caused by contaminated feed prepared from animal carcasses.

9.   Health minister Luc Van den Bossche said the government has weeded out all suspected farms that used contaminated animal feed.

10.   Investigators believe the cow contracted the disease by eating contaminated animal feed.