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                                                                 Order Code RS22345
                                                                 Updated July 18, 2006



 CRS Report for Congress

               Received through the CRS Web



  BSE (Mad Cow Disease): A Brief Overview

                            Geoffrey S. Becker
                      Specialist in Agricultural Policy
                Resources, Science, and Industry Division

Summary


     The appearance of BSE (bovine spongiform encephalopathy or mad cow disease)
 in North America in 2003 raised meat safety concerns and disrupted trade for cattle and
 beef producers. A major issue for Congress has been how to rebuild foreign confidence
 in the safety of U.S. beef and regain lost markets like Japan and Korea. Among other
 issues are whether additional measures are needed to further protect the public and cattle
 herd, and concerns over the relative costs and benefits of such measures for consumers,
 taxpayers and industry. This report will be updated if significant developments ensue.1

 What Is BSE?

     BSE (bovine spongiform encephalopathy or mad cow disease) is a fatal
neurological disease of cattle, believed to be transmitted mainly by feeding infected cattle
parts back to cattle. More than 187,000 cases have been reported worldwide, 183,000 of
them in the United Kingdom (UK) where BSE was first identified in 1986. The annual
number of new cases has declined steeply since 1992. Humans who eat contaminated
beef are believed susceptible to a rare but fatal brain wasting disease, variant Creutzfeldt-
Jakob disease (vCJD). About 160 people, most in the UK, have been diagnosed with
vCJD since 1986, but none has been linked to any Canadian or U.S. meat consumption.

BSE in North America

     BSE has been reported in 11 North American cattle, 10 born here and one imported
from the UK. The first native case was an Alberta, Canada, beef cow reported in May
2003. Canada has since reported six more cases, most recently in July 2006 in a 50-
month-old dairy cow in Manitoba. The first U.S. case was in a Canadian-born dairy cow
found in Washington state in December 2003. The other two U.S. cases were a 12-year-
old Texas-born and -raised beef cow, found in November 2004 but not confirmed until
June 2005, and a 10-year-old Alabama beef cow found in late February 2006.


1 This report, which replaces CRS Issue Brief IB 10127, Mad Cow Disease: Agricultural Issues
for Congress, summarizes and updates information in other CRS reports, listed on page 6.
Sources for facts and citation to reports and studies can be found in these CRS reports.

       Congressional Research Service +o The Library of Congress

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