Chemical methods of control: DISINFECTANTS AND ANTISEPTICS 3. The effectiveness of disinfectants length of time it takes tants against Serratia marcescens are as follows: can be measured in DRT values. DRT, or decimal reduction time, is the to kill 90% of a test population of bacteria. The DRT values for contact lens disinfec- tstetoctantDRT Value (min) Disinfectant Disinfectant Thimerosal, 0.002% Polyquaternium-1, 0.001% DRT Value (min) Chlorhexidine, 0.005% 2.8 138.9 Hydrogen peroxide, 3% 3.1 383.3 What is the minimum time that lenses with 102 which disinfectant is most effective? bacteria should be soaked in chlorhexidine? In polyquaternium-1? Acanthamoeba? What if the lenses are contaminated with Staphylococcus or Why isn't a higher concentration of disinfectant used?
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