"Outbreak points out vulnerability of U.S. food supply"
 

Outbreak points out vulnerability of U.S. food supply
An isolated case of mad cow disease and an outbreak of bird flu on
U.S. farms indicates the vulnerability of American agriculture to
disease — either spread accidentally or intentionally —
and the economic disruption that could result.
at http://www.washtimes.com/business/20...3735-7683r.htm

and "Hitting America's Soft Underbelly: The Potential Threat of
Deliberate Biological Attacks Against the U.S. Agricultural and Food
Industry" (MG-135-OSD), is located at
http://www.rand.org/publications/MG/MG135/MG135.pdf