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                                                                 Order Code RS22345
                                                             Updated January 31, 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 has raised public health 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. 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.'

 What Is BSE?

     BSE (bovine spongiform encephalopathy or mad cow disease) is a fatal
neurological disease of cattle. It is believed to have spread mainly, if not exclusively, by
feeding infected cattle parts back to cattle. More than 187,000 cases have been reported
in 26 countries, about 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). Although about 160 people
have been diagnosed with vCJD since 1986, most in the UK, no case of the disease has
been attributed to any Canadian or U.S. meat consumption.

BSE In North America

     BSE has been reported in six cattle born in North America. The first was an Alberta,
Canada, beef cow reported in May 2003. In the United States, a Canadian-born dairy cow
was found in Washington state in December 2003, and a Texas born and raised beef cow
was found in November 2004 (but not confirmed until June 2005). The other 3 were in
Canada, the most recent reported January 2006 in a nearly six-year-old cow from Alberta.
(A seventh case, in late 1993, was in a British-born cow imported earlier into Canada.)


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 . The Library of Congress

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