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Regional Emergence of TB Lesions in Swine Identified at Slaughter


A case study presented at the November 2010 Iowa Annual Swine Disease Conference for Swine Practitioners detailed increases in STB lesions beginning January 2010 [1]. Producers were informed of the problem by their swine processing facility. Tissue samples from affected producers were culture-positive for Mycobacterium avium. In the spring of 2010, USDA Veterinary Services (VS) began monitoring weekly ADRS STB carcass condemn data after a VS Staff Officer was made aware of unusual increases in STB condemns in another region. By June 2010, STB condemn rates in both of the affected areas decreased to typical seasonal levels; however, beginning January 2011 rates again rose beyond baseline seasonal highs, exceeding those seen in the 2010 outbreak.


This paper characterizes a regional outbreak of tuberculosis (TB) in market swine by combining local swine producer-based information on condemned stock at slaughter with geographically broader FSIS Animal Disposition Reporting System (ADRS) data. This study aims to obtain summary information on anomalous swine TB (STB) condemns at slaughter, compare critical outbreak time frames between outbreak areas, and identify the geographical spread of abnormally high STB condems.

Submitted by elamb on