Establishment of evaluation method for disinfection efficacy of positive pressure bio-protective hood / 医疗卫生装备

ABSTRACT

Objective To establish a method for evaluating the disinfecting effect of positive-pressure protective hoods by testing the disinfecting effect of canine influenza virus(CIV)on the positive-pressure protective hood with 1％Virkon S disinfectant.Methods The neutralizer was selected considering the characteristics of 1％Virkon S disinfectant in accordance with"Disinfection technical specifications"(2002 edition),and the effectiveness of the neutralizer was verified by determining median tissue culture infectious dose(TTCID50)of different samples inoculated with canine renal cells;in the same environment the effects of viral vectors and environment on viral activity were detected by measuring the TCID50 at different time points when CIV acted on the positive pressure protective hood;the optimal disinfection time was determined by establishing a viral vector model and a viral infiltration and sampling method,combining the results of viral recovery rates by real-time quantitative polymerase chain reaction and enzyme-linked immunosorbent assay and viral titer measurements by TCID50 and 50％egg infectious dose(EID50).Results The phosphate buffer solution of 0.1％lecithin,2％Tween 80 and 0.5％sodium thiosulfate could be used as a neutralizer for 1％Virkon S disinfectant;the viral vectors and environment had no effects on CIV activity at different time points;the average recover rate was 96.12％for the samples inoculated with canine renal cells and 95.98％for the chicken eggs,and 1％Virkon S disinfectant behaved the best 4 min after its action on CIV on the positive-pressure protective hood.Conclusion The method proposed for evaluating the disinfection effect of the positive-pressure protective hood is effective in establishing optimal disinfection conditions for the positive-pressure protective hood.[Chinese Medical Equipment Journal,2023,44(9):33-37]