Source: USDA, 8/12/11

In July 2009, the agency started a phased implementation of a residue in-plant test called the Kidney Inhibition Swab (KISTM) test, replacing the current Fast Antimicrobial Screen Test (FAST).

The first phase of implementing the KISTM test was limited to 101 selected cattle slaughter establishments. Following this successful transition, on Aug. 16, 2010, FSIS replaced the FAST with KISTM tests in all cattle slaughter establishments as detailed in FSIS Notice 42-10, Using the Kidney Inhibition Swab (KISTM) Test to Detect Antimicrobial Drug Residues in Cattle in Selected Establishments- Phase II.

Effective Sep. 11, 2011, the agency plans to move to the third phase of this process, with the implementation of KISTM tests in selected swine slaughter establishments that also slaughter cattle, where the test is already being used.

In general, this new test offers a better range of detection that includes more recent compounds of interest and reflects current tolerances set by FDA. The comparison of the two tests by the agency demonstrates that the KISTM test identifies a wider range of residues. In addition, it allows better ability to capture some drug residues like sulfa drugs.

The FSIS notice detailing phase III implementation will be published on the agency website shortly. In 2012, FSIS plans to implement the KISTM test in all remaining swine slaughter plants nationwide.