Table 4.

Antagonistic effect of probiotics against selected strains of E. coli using the agar spot test.

E. coli Strain	Mean Inhibition Zone Diameter * (mm ± SD)
	SSP1	SSP2	SSP3	SSP4	SSP5	MSP1	MSP2	MSP3	MSP4
EAEC1	2.50 ± 0.71	3.00 ± 0.71	9.67 ± 3.51	1.50 ± 0.58	1.00 ± 0.50	12.00 ± 2.00	4.00 ± 0.57	8.67 ± 1.50	5.00 ± 0.82
EAEC2	1.00 ± 0.50	1.50 ± 0.41	4.00 ± 0.53	1.50 ± 0.71	1.00 ± 0.63	8.00 ± 0.82	5.50 ± 1.93	9.00 ± 1.00	5.50 ± 0.71
EAEC3	2.00 ± 0.82	2.50 ± 0.41	5.00 ± 0.53	1.00 ± 0.66	1.00 ± 0.44	7.00 ± 1.50	6.50 ± 2.14	5.50 ± 0.71	7.50 ± 0.58
EPEC1	4.50 ± 0.71	3.50 ± 0.50	5.00 ± 0.50	1.00 ± 0.53	1.00 ± 0.41	10.33 ± 1.15	5.50 ± 1.87	3.50 ± 0.71	5.00 ± 0.50
EPEC2	3.50 ± 0.71	2.67 ± 0.47	6.5 ± 0.71	2.00 ± 0.30	1.00 ± 0.63	4.5 ± 0.71	3.17 ± 0.48	4.0 ± 1.41	5.50 ± 0.72
ETEC	2.00 ± 0.57	3.00 ± 0.82	9.00 ± 2.65	1.00 ± 0.20	2.00 ± 0.82	5.00 ± 1.41	3.50 ± 1.04	3.5 ± 0.71	5.50 ± 0.71
ESBL	5.00 ± 0.50	4.00 ± 1.00	5.0 ± 1.00	1.00 ± 0.35	3.00 ± 1.00	3.50 ± 0.71	5.50 ± 1.80	2.00 ± 0.50	5.50 ± 1.00
Ec K12	0.00 ± 0.00	1.67 ± 0.47	9.00 ± 1.41	2.50 ± 0.71	1.00 ± 0.63	6.00 ± 1.41	4.50 ± 1.18	2.00 ± 0.50	9.5 ± 0.71
Mean	2.05	2.73	6.64	1.44	1.38	7.04	4.77	4.77	6.12

* mean of three separate trials in mm, measured from the outer edge of the colony to the edge of the clear zone.