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Reusable surface disinfectant (SD) tissue dispensers are used in hospitals in many countries because they allow immediate access to soaked tissues for targeted surface decontamination. Kampf et al. (2013) determined the frequency of contaminated SD solutions in reusable dispensers and the ability of isolates to multiply in different formulations.
Dispensers with different SD were randomly collected from healthcare facilities. Solutions were investigated for bacterial contamination using standard microbiological methods. Isolates of the same species were investigated by pulsed-field gel electrophoresis (PFGE) for clonal identity. The efficacy of two SD was determined in suspension tests (EN 13727) under dirty conditions against two isolated species directly from a contaminated solution or after five passages without selection pressure in triplicate. Fresh use solutions of four different types of SD were contaminated with a fresh dispenser isolate to determine its survival or multiplication over 28 days.
Sixty-six dispensers containing SD solutions with surface-active ingredients were collected from 15 healthcare facilities. Twenty-eight dispensers from nine healthcare facilities were contaminated with approximately 107 cells per mL of Achromobacter species 3 (9 hospitals), Achromobacter xylosoxidans or Serratia marcescens (one hospital each). Clonal non-identity was shown for 8 of 9 Achromobacter species 3 isolates. In none of the hospitals dispenser processing was adequately performed. Isolates regained susceptibility to the SD after five passages without selection pressure, for example against Achromobacter species 3 with a mean log10-reduction of 0.06 initially and 2.37 after five passages (Incidin plus 0.5% for 60 min). Adapted and passaged cells were equally able to multiply in different formulations from different manufacturers with surface-active ingredients at room temperature within seven days to a cell count of 107 bacteria per mL, only a formulation with additional aldehyde was able to completely kill the contamination.
The researchers say neglecting adequate processing of tissue dispensers has contributed to frequent and heavy contamination of use-solutions of SD based on surface active ingredients.
Disclosures: G. Kampf is an employee of Bode Chemie GmbH, Hamburg, Germany;Â H. von Baum: none declared,; C. Ostermeyer is an employee of Bode Chemie GmbH, Hamburg, Germany.
Reference: Kampf G, von Baum H and Ostermeyer C. Oral presentation O067 at the 2nd International Conference on Prevention and Infection Control (ICPIC 2013): Poorly processed reusable dispensers for surface disinfection tissues are a possible source of infection. Antimicrobial Resistance and Infection Control 2013, 2(Suppl 1):O67 doi:10.1186/2047-2994-2-S1-O67.