Table 1.

The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of antibiotics, ethanol extract of Rhodomyrtus tomentosa, and rhodomyrtone against clinical Streptococcus pyogenes isolates.

Antibacterial agents	Antibacterial activity (μg mL−1)						Resistance (%)
	*MIC50	†MIC90	MIC range	‡MBC50	§MBC90	MBC range
Antibiotics (n = 47)
Erythromycin	<0.015	0.031	<0.015–0.125	0.031	0.031	<0.015–0.125	0
Penicillin G	<0.015	<0.015	<0.015–0.062	<0.015	0.031	<0.015–0.062	0
Plant extract/compound
Ethanol extract (n = 47)	7.81	15.62	3.91–62.50	15.62	15.62	3.91–62.50
Rhodomyrtone (n = 14)	0.78	1.56	0.39–1.56	1.56	1.56	0.39–1.56

*MIC at which 50% of the isolates were inhibited (MIC₅₀).

^†MIC at which 90% of the isolates were inhibited (MIC₉₀).

^‡MBC at which 50% of the isolates were killed (MBC₅₀).

^§MBC at which 90% of the isolates were killed (MBC₉₀).

n: Number of test isolate.