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Pesticide News Story: EPA Seeks Scientific Review on the Statistical Model Associated with Methods to Evaluate Effectiveness of Hospital Disinfectants

For Release: November 20, 2012

The EPA is seeking technical review from the Association of Official Analytical Chemists (AOAC) of a statistical model and associated calculations for evaluating the results of the AOAC Use-Dilution Methods (UDM), a method that measures the efficacy of antimicrobial pesticides against Staphylococcus aureus and Pseudomonas aeruginosa.  Adoption of this model and calculations  may result in a change to the  performance standard associated with the UDM. Ensuring the efficacy of hospital disinfectants is a priority for the EPA’s Antimicrobial Testing Program, a post-registration product surveillance program. 

Employing contemporary modeling techniques, the EPA reassessed the performance standard using a statistical analysis of data from a five-laboratory collaborative study conducted in 2009.  Discussions regarding these data were held with stakeholders at a 2011 workshop at the EPA Office of Pesticide Programs Microbiology Laboratory. The EPA is seeking involvement and input from interested stakeholders and the general public on the enhancements. 

To be registered by the EPA, public health disinfectants such as those for use in the healthcare environment must be demonstrated to be effective against S. aureus and P. aeruginosa. The EPA accepts the UDM to support the registration of those products – liquid antimicrobial products bearing claims to control microorganisms that pose a threat to human health on hard, inanimate surfaces.

Various documents are available at www.regulations.gov in Docket Number EPA HQ OPP 2011 0842-0034.

The EPA is available to meet with affected stakeholders to discuss and clarify the model and calculations described in the manuscript. For more information, please contact Dr. Stephen Tomasino at (410)305-2976 or tomasino.stephen@epa.gov.


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