Table 2.
Antibacterial effects of acetone stem bark extract of A. mearnsii and the different first-line antibiotics.
| Tested bacterial isolates | Minimum inhibitory concentrations (MIC) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| AMA | Ery | Tet | Met | Amx | Cip | Nal | Chl | Kan | |
| mg/mL | µg/mL | ||||||||
| Escherichia coli ATCC 25922 | 0.625 | 0.391R | 0.976S | 31.250R | 3.906S | 0.039S | 1.953S | 3.906S | 125R |
| Bacillus cereus ATCC 10702 | 0.156 | 0.098S | 0.244S | 31.250R | 7.813R | 0.078S | 15.625S | 3.906S | 125R |
| Pseudomonas aeruginosa ATCC 19582 | 0.156 | 0.195S | 0.488S | 15.625R | 3.906S | 0.156S | 7.813S | 3.906S | 31.25R |
| Serratia marcescens ATCC 9986 | 0.625 | 3.125R | 15.625R | 31.250R | 31.25R | 0.078S | 1.953S | 0.977S | 1.953S |
| Enterococcus faecalis KZN | 0.625 | 12.500R | 15.625R | 62.500R | 0.977S | 0.313S | 62.500R | 31.250R | 500R |
| Staphylococcus aureus OK1 | 0.078 | 0.195S | 0.976S | 15.625R | 0.977S | 0.078S | 62.500R | 7.813R | 15.625R |
| Salmonella typhi ATCC 13311 | 0.313 | 6.250R | 0.244S | 31.250R | 0.977S | 0.0195S | 7.813S | 3.906S | 15.625R |
| Micrococcus luteus | 0.039 | 0.391R | 31.250R | 31.250R | 0.488S | 1.250R | 62.500R | 1.953S | 250R |
| Proteus vulgaris CSIR 0030 | 0.156 | 0.048S | 0.488S | 62.500R | 0.244S | 0.0195S | 62.500R | 31.250R | 31.25R |
| Shigella flexneri KZN | 0.078 | 0.195S | 0.488S | 62.500R | 250.000R | 0.039S | 62.500R | 7.813 | 15.625R |
S: sensitive; R: resistant; AMA: acetone extract of A. mearnsii; Ery: erythromycin; Tet: tetracycline; Met: metronidazole; Cip: ciprofloxacin; Nal: nalidixic acid; Chl: chloramphenicol; Kan: kanamycin.