Table 1.

Microbicidal effect (ME) values ^a.

	S. aureus		E. coli
	5 h	24 h	5 h	24 h
SURF-SH	−0.1	−0.1	−0.2	−0.3
SURF-SDM	0.4	0.2	0.3	0.1
SURF-Ag-SDM	0.8	6.1	1.0	4.0

^a All values are obtained as an average of four experiments. ME = log N_C − log N_E (N_C is the number of CFU/mLdeveloped on the unmodified control glasses, and N_E being the number of CFU/mLcounted after exposure to modified glasses; CFU = colony forming unit).