Development of a silver-based dual-function antimicrobial laundry additive and textile coating for the decontamination of healthcare laundry

摘要

Aims To repurpose a silver-based antimicrobial textile coating product (Micro-Fresh 1911) as a dual-function antimicrobial laundry additive and textile coating. Methods and Results Survival ofEscherichia coliorStaphylococcus aureustype and clinical isolates in a domestic 40 degrees C wash was assessed with and without soiling and biological detergent. Washing with 2% w/v silver additive (wash phase) reducedE. coliandS. aureusby 7 center dot 14-8 center dot 08 log(10)and no cross-contamination was observed. Under dirty conditions, 0 center dot 5% silver additive in the rinse phase of a wash with biological detergent reducedE. coliandS. aureusby 7 center dot 98-8 center dot 40 log(10)(0 center dot 00-1 center dot 42 log(10)cross contamination). BS EN ISO 20645:2004 and BS EN ISO 20743:2013 methods were used to assess the antimicrobial activity of polycotton washed with 2% w/v silver additive againstS. aureusandE. coli. The treated polycotton was antimicrobial againstE. coliandS. aureustype and clinical isolates and remains active after at least one further wash cycle at 40 or 73 degrees C. Conclusions The silver additive exhibits antimicrobial activity in a 40 degrees C domestic wash, preventing cross contamination onto clean textiles and depositing an antimicrobial coating onto polycotton. Significance and Impact of the Study The survival of micro-organisms on healthcare uniforms during domestic laundering presents a potential risk of contaminating the home, cross-contamination of other clothing within the wash and transmitting potential pathogens back into healthcare settings via contaminated uniforms. Silver may be useful as an antimicrobial laundry additive to decontaminate healthcare laundry washed at low temperatures in domestic and industrial settings, to therefore reduce the potential risk of transmitting micro-organisms within the domestic and clinical environments.