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Science 24 September 2004:
Vol. 305. no. 5692, pp. 1918 - 1921
DOI: 10.1126/science.1103581
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Perspectives

BIOMEDICINE:
A Fresh Look at BSE

Bruce Chesebro

The discovery of two cows with bovine spongiform encephalopathy (BSE) in North America in the past year has dramatically increased concern about the threat posed by BSE to human health and domestic livestock in the United States and Canada. In his Perspective, Chesebro discusses the possible etiology of BSE in the two infected animals and suggests possible ways to prevent the spread of BSE.

The author is in the Laboratory of Persistent Virus Diseases, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, Hamilton, MT 59840, USA. E-mail: bschesebro{at}nih.gov

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