This notice announces the discontinuation of phenol resistance testing as a part of efficacy testing for antimicrobial disinfectants and sanitizers. Effective immediately, the Agency will consider registering or reregistering antimicrobial disinfectant or sanitizer pesticides without supporting phenol resistance testing. All other data in support of registration or reregistration, including any required efficacy testing data, must be submitted and then accepted by the Agency. 

• PRN 2001-4: Elimination of Phenol Resistance Testing for Antimicrobial Disinfectant and Sanitizer Pesticides (PDF)(4 pp, 95 K)