Robotic versus manual disinfection of global priority pathogens at COVID-19-dedicated hospitals

Twelve bacterial families identified as global priority pathogens (GPPs) pose the greatest threat to human health due to declining antibiotic efficacy. Robotics, a swift and contactless tool for disinfecting hospital surfaces, was sought to compare with manual disinfection.

The disinfection efficacy of a robot was compared with manual disinfection for multiple clinical surfaces and inanimate objects at two hospitals in Nepal using bleach (NaOCl). Surfaces were swabbed pre- and post-disinfection and total heterotrophic plate count evaluated, and bacterial pathogens identified using Gram's staining and biochemical characteristics. Disinfection outcomes were reported as log reduction (log10 CFU/inch²) of heterotrophic count and presence or absence of GPPs: Staphylococcus aureus, Escherichia coli, Acinetobacter spp., and Klebsiella pneumoniae, among others.

Both robotic and manual disinfection significantly reduced the microbial load (log 2.3 to log 5.8) on hospital surfaces. No pathogens were detected post-disinfection using the robot. Robotic disinfection was more effective, significantly reducing the bacterial load (log 5.8) compared to manual disinfection (log 3.95).

Our results showed better efficacy of robotic disinfection over manual disinfection of hospital surfaces, and thus contactless robotic disinfection is recommended for disinfecting surfaces in the hospital and clinical settings as it favors patient safety against GPPs.