New Mad Cow Disease Doesn't Show Up On US Tests

A new form of mad cow disease has been found in Italy, according to a study released yesterday, and scientists believe that it may be the cause of some cases of human brain-wasting disease.

While the strain has been found in only two Italian cows, both apparently healthy, scientists in Europe and the United States said it should provide new impetus in Washington for the Department of Agriculture to adopt the more sensitive rapid tests used in Europe because it may not show up in those used in the United States.

Along with the Italian study, there have been recent reports of unusual types of mad cow disease in France and Japan, and scientists say the discovery of new forms suggests that many cases of "sporadic" human disease — by far the most common kind, responsible for about 300 deaths a year in the United States — are not spontaneous at all, but come from eating animals.