Table 5: Zones of Inhibition (ZOI) of the growth of S. aureus surrounding sections of endoscope insertion tube materials after three 10-minute exposures to OPA, three 100 mL rinses, followed by wiping with acetonitrile or 3% hydrogen peroxide and three 100 mL rinses. The numbers reported are the mean ± standard deviation of three replicates in mm.

Endoscope materialOPAAcetonitrile3% hydrogen peroxide
Three 10 min exposures/rinsesa
ZOI (mm)
Three 10 min OPA exposures/rinsesa, Wipe/rinsesb
ZOI (mm)
Wipe/ rinsesb
ZOI (mm)
Three 10 min OPA exposures/rinsesa, Wipe/rinsesb
ZOI (mm)
Wipe/ rinsesb
ZOI (mm)

Viton
Insertion tube

a Inbetween each 10 minutes OPA soak materials were rinsed three times with 100 mL of tap water.
b After wiping with acetonitrile or hydrogen peroxide materials were rinsed three times with 100 mL of tap water.