Animal diseases impact food supplies, trade and commerce, and human health worldwide.Some outbreaks have had severe consequences on the economies and social well-being of the population in affected countries.This paper discusses patterns of livestock diseases, factors affecting the emergence of diseases, impacts on human health, and international monitoring and response efforts. Cochairs: James Pearson, International Consultant, Ames, Iowa, and M.D. Salman, Colorado State University, Fort Collins. IP 28, February 2005, 16 pp., FREE. Available online (www.cast-science.org) AND in print (515-292-2125; fee for shipping/handling).