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lüll The risk of cross-infection when marking surgical patients prior to surgery - review of two types of marking pens Ballal MS; Shah N; Ballal M; O'Donoghue M; Pegg DJAnn R Coll Surg Engl 2007[Apr]; 89 (3): 226-8INTRODUCTION: Two types of marker pens were compared to find whether they produced different risks of infection transmission over different time intervals. PATIENTS AND METHODS: Twenty-four patients were marked according to the type of surgery: each had a set of new dry white-board marker (DWM) and a permanent marker (PM) pen. Once used, their tips were used to inoculate blood agar plates at different time intervals. RESULTS: At 0 min, 96% of the DWM pens and 29% of the PM pens were positive of growth. At 3 and 10 min, all of the DWM pens remained positive. The rate dropped to 16.67% in 3 min down to none at 10 min for the PM pens. CONCLUSIONS: DWM pens carry a significant risk of transmitting infection between patients. It is recommended that they are not used in marking. PM pens should not be used between patients in less than a 10-min interval.|*Equipment Contamination[MESH]|*Surgical Instruments[MESH]|Alcohols/analysis[MESH]|Cross Infection/*transmission[MESH]|Humans[MESH]|Preoperative Care/*instrumentation/methods[MESH]|Prospective Studies[MESH]|Risk Factors[MESH]|Skin Diseases, Infectious/transmission[MESH] |