Table 3.
Association of the presence of silver resistance genes with the minimum inhibitory concentration of silver nitrate. P values are calculated with Cochran chi-square test.
| Organisms | Presence of sil genes | Number of isolates | Silver nitrate MIC (μg/ml), n(%) |
P value | |||||
|---|---|---|---|---|---|---|---|---|---|
| 16 | 32 | 64 | 128 | 256 | ≥512 | ||||
| E. coli (n = 85) | Positive | 44 | – | – | 2 (5) | – | 9 (20) | 33 (75) | <0.001 |
| Negative | 41 | 5 (12) | 9 (22) | – | 20 (49) | – | 7 (17) | ||
| K. pneumoniae (n = 65) | Positive | 22 | – | – | – | 4 (18) | 6 (27) | 12 (55) | 0.008 |
| Negative | 43 | 5 (12) | 7 (16) | – | 2 (4) | 10 (23) | 19 (44) | ||
| P. mirabilis (n = 40) | Positive | 11 | – | – | 3 (27) | 2 (18) | – | 6 (55) | 0.001 |
| Negative | 29 | 3 (10) | 12 (42) | 10 (34) | 2 (7) | – | 2 (7) | ||
| P. aeruginosa (n = 50) | Positive | 16 | – | – | – | 4 (25) | 2 (12) | 10 (63) | 0.001 |
| Negative | 34 | 5 (15) | 12 (35) | 5 (15) | 9 (27) | – | 3 (8) | ||
| A. baumannii (n = 25) | Positive | 5 | – | – | – | 1 (20) | 4 (80) | 0.087 | |
| Negative | 20 | 1 (5) | 4 (20) | 4 (20) | 5 (25) | 3 (15) | 3 (15) | ||
| S. aureus (n = 121) | Positive | 47 | – | – | – | 8 (17) | 10 (21) | 29 (62) | 0.001 |
| Negative | 74 | 6 (8) | 6 (8) | 5 (7) | 18 (24) | 20 (27) | 19 (26) | ||
| E. cloacae (n = 30) | Positive | 10 | – | – | – | – | 3 (30) | 7 (70) | 0.001 |
| Negative | 20 | 2 (10) | 7 (35) | 3 (15) | 6 (30) | 2 (10) | – | ||
| S. agalactiae (n = 40) | Positive | 0 | – | – | – | – | – | – | N/A |
| Negative | 40 | 6 (15) | – | 15 (38) | 4 (10) | 11 (28) | 4 (9 ) |
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