Category: natural occurring

<a href="http://www.forbes.com/business/feeds/ap/2006/06/11/ap2807633.html">U.S. Mad Cow Cases Are Mysterious Strain</a><br />n<br />n<blockquote>Two cases of mad cow disease in Texas and Alabama seem to have resulted from a mysterious strain that could appear spontaneously in cattle, researchers say.<br />n<br />nGovernment officials are trying to play down differences between the two U.S. cases and the mad cow epidemic that…