Automated decontamination of surface-adherent prions

Area of Science:

• Medical Microbiology
• Infectious Disease Prevention
• Biotechnology

Background:

• Reusable surgical instruments pose a risk for iatrogenic prion disease transmission due to inadequate routine decontamination procedures.
• Current washer-disinfector protocols cannot reliably eliminate prions, compromising patient safety.
• Effective prion decontamination methods integrated into standard surgical instrument reprocessing are urgently needed.

Purpose of the Study:

• To evaluate an automated washer-disinfector process for effective prion decontamination on surgical instruments.
• To assess the efficacy of the automated process against surface-adherent 22L prions using a sensitive in vivo assay.
• To compare the automated process with conventional alkaline cleaning and autoclaving.

Main Methods:

• Evaluation of an automated prion decontamination process in washer-disinfectors.
• Utilized a quantitative, highly sensitive in vivo assay to detect surface-adherent 22L prions.
• Compared the automated process efficacy against conventional alkaline cleaning and autoclaving at 134°C for 2 hours.

Main Results:

• The automated process demonstrated superior performance compared to conventional alkaline cleaning.
• The automated process achieved efficacy comparable to autoclaving, eliminating detectable prion infectivity from heavily contaminated surfaces.
• A reduction of surface-adherent prion infectivity exceeding 7 log units was observed.

Conclusions:

• The automated washer-disinfector process offers a highly effective method for prion decontamination.
• The process is compatible with delicate surgical instruments and suitable for large-scale reprocessing in sterile supply departments.
• This automated system holds significant potential for preventing iatrogenic prion disease transmission.