Table 2: Zones of Inhibition (ZOI) of S. aureus on endoscope insertion tube material and Viton bending rubber following one or five 10 minute exposures to the high level disinfectant, followed by three 100 mL rinses after each exposure. The numbers reported are the mean ± standard deviation of three replicates in mm.

Endoscope materialGA @ 25°C or GA-IPA @ 20°COPA @25°C
One 10 min exposure
ZOI (mm)
Five 10 min exposures
ZOI (mm)
One 10 min exposure
ZOI (mm)
Five 10 min exposures
ZOI (mm)

Viton bending rubber

Colonoscope insertion tube