An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Use Dilution Method Performance Standard Revision Document

The AOAC use-dilution methods (UDM) 955.15 (Staphylococcus aureus) and 964.02 (Pseudomonas aeruginosa) are laboratory assays used to measure the antimicrobial efficacy of liquid disinfectants on inanimate surfaces. Products must pass tests of both microbes for a hospital disinfectant claim.

EPA reassessed the method's performance standard.  This document describes the reassessment and the resulting performance standard criteria changes.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.