Fig. 1.

Data on two categories of animal disease reported to the World Organization for Animal Health during the period 1996–2004. List B disease outbreaks (Upper) and list A disease outbreaks (Lower) are reported against the value of average imports of risk materials in the same period. Data are ranked by disease outbreaks. Sources: Disease outbreaks, World Organisation for Animal Health at http://www.oie.int/eng/info/en_infold.htm?e1d5. Trade volumes, Comtrade database at http://comtrade.un.org/db/.