Preliminary investigation of bacterial surface contamination in emergency ambulances in South Korea

초록

Background Emergency ambulances are vital in prehospital care but carry a high risk of healthcare-associated infections due to confined spaces, high patient turnover, and brief cleaning intervals. Routine disinfection protocols are in place; however, their effectiveness in South Korean ambulances has not been formally evaluated. Methods This pre-post observational study examined bacterial contamination on six high-touch surfaces across five operational ambulances in Province G, South Korea. Swabs were collected immediately before and after daily disinfection performed by paramedics. Bacterial load was quantified using colony-forming units (CFUs), and species identification was conducted via 16 S rRNA sequencing. Statistical analyses included paired t-tests, ANOVA, Cohen's d, and MANOVA to evaluate the cleaning efficacy and contamination patterns. Results All six surfaces were contaminated before cleaning, with the highest CFUs recorded on the ventilation outlet (182.6 +/- 48.3), SpO(2) sensor (145.2 +/- 35.7), and stretcher handle (122.4 +/- 22.6). Disinfection significantly reduced bacterial load across all surfaces (p < 0.05), yet residual contamination remained on the SpO(2) sensor (Bacillus velezensis) and stretcher handle (Williamsia muralis). ANOVA revealed significant differences in baseline contamination (F(5,24) = 78.52, p < 0.001), and MANOVA confirmed that cleaning effectiveness varied by surface geometry (Wilks' Lambda = 0.202, p < 0.001). Conclusions Manual disinfection significantly lowers bacterial load in ambulances, but residual contamination on complex, high-touch surfaces remains problematic. These findings underscore the need for multimodal disinfection approaches, improved equipment design, and systematic microbial surveillance to enhance EMS infection control standards.

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