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. 2012 Jun 14;3:195. doi: 10.3389/fphys.2012.00195

Figure 2.

Figure 2

Historical record of CFT outbreaks in the U.S. Each fiscal year shows the contribution by the Permanent Quarantine and Free Zones to the total number of outbreaks. The Free Zone comprises the area in the 48 contiguous states outside the Permanent Quarantine Zone, which is located along the Rio Grande in southern Texas. The period shown in the graph depicts records maintained by USDA-APHIS-Veterinary Services and it covers fiscal years 1959 through 2011. Data updated after Pérez de León et al. (2010).