Results

			24-h IC₅₀^a		MIC^b
Test compound	24-h IC₅₀^a	MIC^b	RDCF^c	RDCO^d	24-h IC₅₀^a	MIC^b
Flor*	0.21 (0.01)	0.36 (0)
Oxy**	0.1 (0.01)	0.05 (0)
1	>74.7	>74.7	>373.5	>747.0	>207.5	>149.4
2	>74.7	>74.7	>373.5	>747.0	>207.5	>149.4
3	>74.7	>74.7	>373.5	>747.0	>207.5	>149.4
4	>74.7	>74.7	>373.5	>747.0	>207.5	>149.4
Mix	>74.7	>74.7	>373.5	>747.0	>207.5	>149.4

*Florfenicol; **Oxytetracyline HCl
^a24-h IC₅₀ = 50% inhibition concentration in mg/L.
^bMIC = Minimum inhibitory concentration in mg/L.
^cRDCF = Relative-to-drug-control florfenicol; values closer to 1.0 indicate higher antibacterial activity compared to florfenicol.
^dRDCO = Relative-to-drug-control oxytetracycline; values closer to 1.0 indicate higher antibacterial activity compared to oxytetracycline.

Table 2: Results of the bioassay evaluation of antimicrobial compounds from American sycamore leaves for antibacterial activity against Edwardsiella ictaluri S02-1039. Numbers in parentheses are the standard error of the mean