Research Article
Antimicrobial Potential of Streptomyces spp. Isolated from the Rift Valley Regions of Ethiopia
Table 2
Inhibition zone of the actinomycete isolates against the test pathogens.
| Test pathogens | S.No. | Isolates code | Gram-negative bacteria | Gram-positive bacteria | Fungi | Ec | Kp | Pa | St1 | St2 | Sa | Se | A. niger |
| 1 | RVE002 | 32 ± 0.45 | 30 ± 0.20 | 27 ± 0.20 | 17 ± 0.58 | 20 ± 0.96 | 12 ± 0.35 | 20 ± 0.30 | 22 ± 0.58 | 2 | RVE004 | — | 14 ± 0.31 | 14 ± 0.50 | 24 ± 0.16 | 28 ± 0.65 | 27 ± 0.77 | 21 ± 0.30 | 11 ± 0.6 | 3 | RVE029 | 24 ± 0.45 | — | — | 13 ± 0.16 | 15 ± 0.96 | 25 ± 0.77 | 26 ± 0.30 | 14 ± 0.6 | 4 | RVE077 | 17 ± 0.33 | 8 ± 0.20 | 27 ± 0.50 | — | — | 10 ± 0.50 | 13 ± 0.58 | 20 ± 0.0 | 5 | RVE116 | 16 ± 0.20 | 22 ± 0.50 | — | 15 ± 0.60 | — | 16 ± 0.58 | 15 ± 1.16 | 12 ± 0.58 | 6 | RVE118 | 15 ± 0.20 | 12 ± 0.50 | 16 ± 0.58 | 17 ± 0.60 | 17 ± 0.65 | 20 ± 1.00 | 20 ± 0.80 | 17 ± 1.20 | 7 | RVE125 | 25 ± 0.33 | 5 ± 0.31 | | 15 ± 0.96 | 27 ± 1.00 | 30 ± 0.60 | 30 ± 0.60 | 10 ± 0.00 | 8 | RVE129 | >35 | 22 ± 0.36 | 17 ± 0.40 | >31 | >31 | >35 | >40 | 30 ± 0.0 | 9 | RVE133 | 22 ± 0.60 | 30 ± 0.31 | 25 ± 0.40 | 22 ± 0.58 | 28 ± 1.00 | 20 ± 1.00 | 10 ± 0.60 | 18 ± 0.58 | 10 | RVE144 | 18 ± 0.45 | — | – | 26 ± 0.58 | 19 ± 1.00 | 21 ± 0.50 | — | 10 ± 0.88 | 11 | RVE165 | 10 ± 0.60 | — | 25 ± 0.40 | 12 ± 0.58 | 12 ± 0.36 | 12 ± 0.50 | — | 12 ± 0.58 | 12 | RVE172 | 20 ± 0.60 | 19 ± 0.31 | 32 ± 0.58 | — | 29 ± 0.50 | 12 ± 0.50 | 14 ± 0.40 | — | 13 | RVE187 | >31 | 27 ± 0.31 | 28 ± 0.10 | >35 | >35 | >40 | >40 | 27 ± 0.0 | 14 | RVE193 | 15 ± 0.33 | 7 ± 0.50 | 5 ± 0.10 | 17 ± 0.60 | 21 ± 1.00 | 20 ± 0.35 | 22 ± 1.16 | 10 ± 0.58 | 15 | RVE194 | 13 ± 0.33 | 18 ± 0.50 | 19 ± 0.58 | 15 ± 0.60 | 18 ± 1.00 | 16 ± 1.16 | 16 ± 1.16 | 17 ± 0.60 | 16 | RVE214 | 15 ± 0.33 | 18 ± 0.36 | 20 ± 0.20 | 16 ± 0.80 | 15 ± 0.50 | 32 ± 0.35 | 33 ± 0.58 | 18 ± 1.20 | 17 | RVE217 | 28 ± 0.20 | 18 ± 0.36 | 28 ± 0.20 | >35 | >35 | >35 | >35 | 30 ± 0.0 | 18 | RVE219 | 18 ± 0.20 | 19 ± 0.50 | 18 ± 0.40 | — | — | 17 ± 0.58 | 14 ± 0.80 | 20 ± 0.6 | 19 | RVE226 | 15 ± 0.45 | 22 ± 0.36 | 18 ± 0.58 | 15 ± 0.8 | 10 ± 0.65 | 33 ± 0.50 | 33 ± 0.58 | — | 20 | RVE227 | 21 ± 0.20 | 16 ± 0.20 | 25 ± 0.40 | 22 ± 0.16 | 16 ± 0.36 | 17 ± 0.58 | — | 18 ± 0.6 | 21 | RVE234 | 25 ± 0.33 | 15 ± 0.31 | 9 ± 0.10 | 31 ± 0.58 | 20 ± 0.50 | 11 ± 1.00 | 14 ± 0.30 | — | 22 | RVE239 | — | 8 ± 0.36 | 8 ± 0.10 | 10 ± 0.58 | 14 ± 0.50 | 24 ± 0.77 | 34 ± 0.30 | 11 ± 0.58 | 23 | RVE257 | 21 ± 0.45 | — | — | 16 ± 0.58 | 15 ± 1.00 | 26 ± 0.77 | 6 ± 0.30 | 14 ± 0.58 | 24 | RVE258 | 19 ± 0.60 | — | 21 ± 0.20 | 30 ± 0.16 | 19 ± 0.36 | 15 ± 0.77 | 13 ± 0.58 | 20 ± 0.0 |
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Note: values are mean of three replicates ± standard deviation (SD). (—): no antimicrobial activity; Sa: Staphylococcus aureus; Ec: Escherichia coli; Pa: Pseudomonas aeruginosa; Kp: Klebsiella pneumoniae; St1: Salmonella typhi ATCC-13311; St2: Salmonella typhi ATCC-14028; Se: Staphylococcus epidermidis; A. niger.
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