Table 1: Zones of Inhibition (ZOI) of S. aureus on four types of bending rubbers and an endoscope insertion tube section following exposure to GA-IPA at 20°C, GA and OPA at 25°C, and rinses with 100 mL of water. The numbers reported are the mean ± standard deviation of three replicates in mm.

Endoscope materialGA @ 25°C or GA-IPA @ 20°COPA @ 25°C
Three or seven rinses
ZOI (mm)
Three rinses
ZOI (mm)
Seven rinses
ZOI (mm)
Fifteen rinses
ZOI (mm)

Rubber A
Insertion tube