Cell enumeration of embedded cells in residual biofilm of
touched coupons was done using a dry sterile swab to wipe
the entire surface of the glass coupons rigorously to remove
the residual biofilm thrice. An untouched coupon severed
as a control. The swab was then submerged in a sterile 15
mL test tube containing 10 mL of 0.1% sterile peptone water
and vortexed. Serial dilutions of bacterial were made and
appropriate dilutions were inoculated on tryptose soya
agar. This was then incubated at optimum temperature
for each bacterial growth. The contamination level was
estimated in log CFU/cm2
thus:
The control coupon-the test coupon at the 3 frequencies
of contact.