Disinfection efficacy of peracetic acid disinfectant (type III) on gastrointestinal endoscopy

Abstract

Objective To evaluate the disinfection efficacy of peracetic acid disinfectant (type Ⅲ ) on gastrointestinal endoscopy. Methods Endoscopes were disinfected respectively by 2% glutaraldehyde (GA group) and peracetic acid disinfectant (type Ⅲ ) (PAA group) according to the process by the 2016 version of "Regulation for cleaning and disinfection technique of flexible endoscope" , and then samples were collected through biopsy channel at the specified steps. The bacterial count and pathogenic bacteria of these samples were detected. Hepatitis B virus surface antigen (HBsAg), hepatitis C virus (HCV) antibody and Treponemia pallidum antibody (TP-Ab) were detected by chemiluminesent microparticle immunoassay (CMIA) in the PAA group. The PAA group were continuously sampled for 5 days. Results A total of 56 gastroscopes and 16 colonoscopes were disinfected in the GA group, and 46 gastroscopes and 15 colonoscopes were disinfected in the PAA group. Compared with pre-disinfection, the bacterial count was both significantly reduced in the two groups after disinfection (P 0.05; total qualified rate: 98.36% (60/61) VS 94.44% (68/72), P>0.05]. The qualified rate of colonoscopes in the two groups were both 100.00% (15/15, 16/16). After disinfecting by peracetic acid disinfectant (Type Ⅲ), HBsAg, anti-HCV and TP-Ab were negative. There were no significant differences on colonies number at different steps in a 5-day continuous sampling (P>0.05). Conclusion Peracetic acid disinfectant (type Ⅲ) can provide a satisfied disinfectant effect, and be applied in clinic to meet the requests of high-level disinfection for gastrointestinal endoscopy. Key words: Endoscopes, gastrointestinal; Disinfectants; Peracetic acid disinfectant (type Ⅲ)