Table 3.
Antimicrobial susceptibility profiles of A. hydrophila isolates from tilapia, carp and channel catfish.
| Antimicrobial Agents | Antimicrobial Susceptibility of A. hydrophila (N = 236) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Tilapia (n = 93) | Carp (n = 89) | Channel Catfish (n = 54) | |||||||
| S (%) | I (%) | R (%) | S (%) | I (%) | R (%) | S (%) | I (%) | R (%) | |
| Penicillins (PNs) | |||||||||
| Oxacillin (Ox) | 0 (0) | 4.4 (4) | 95.7 (89) | 0 (0) | 0 (0) | 100 (89) | 0 (0) | 9.3 (5) | 90.8 (49) |
| Amoxicillin (Ax) | 15.1 (14) | 7.6 (7) | 77.5 (72) | 3.4 (3) | 0(0) | 96.7 (86) | 0 (0) | 0 (0) | 100 (54) |
| Β-Lactam/β-Lactamase inhibitor combination (BL/BLI) | |||||||||
| Amoxicillin-Clavulanic acid (AC) | 76.4 (71) | 15.1 (14) | 8.7 (8) | 73.1 (65) | 18 (16) | 9.0 (8) | 68.6 (37) | 16.7 (9) | 14.9 (8) |
| Cephems (CPs) | |||||||||
| Ceftriaxone (Ct) | 69.9 (65) | 4.4 (4) | 25.9 (24) | 95.6 (85) | 4.5 (4) | 0 (0) | 90.8 (49) | 9.3 (5) | 0(0) |
| Cefuroxime (Cu) | 81.8 (76) | 5.4 (5) | 13.0 (12) | 96.7 (86) | 0 (0) | 3.4 (3) | 100 (54) | 0(0) | 0(0) |
| Cefotaxime (Cx) | 77.5 (72) | 0 (0) | 22.6 (21) | 96.7 (86) | 0 (0) | 3.4 (3) | 100 (54) | 0(0) | 0(0) |
| Macrolides (MCs) | |||||||||
| Erythromycin (Er) | 24.8 (23) | 32.3 (30) | 43.1 (40) | 38.3 (34) | 14.7 (13) | 47.2 (42) | 57.5 (31) | 33.4 (18) | 9.3 (5) |
| Quinolones (QLs) | |||||||||
| Nalidixic (Na) | 54.9 (51) | 0 (0) | 45.2 (42) | 46.1 (41) | 3.4 (3) | 50.6 (45) | 53.8 (29) | 9.3 (5) | 37.1 (20) |
| Sulfonamides (SULs) (Folate pathway inhibitors) | |||||||||
| Sulfamethoxzole- Trimethoprim (SM/TM) |
36.6 (34) | 18.3 (17) | 45.2 (42) | 75.3 (67) | 0 (0) | 24.8 (22) | 68.6 (37) | 9.3 (5) | 22.3 (12) |
| Aminoglycosides (AMGs) | |||||||||
| Neomycin (Ne) | 4.4 (4) | 16.2 (15) | 79.6 (74) | 42.7 (38) | 36.0 (32) | 21.4 (19) | 38.9 (21) | 31.5 (17) | 29.7 (16) |
| Glycopeptide (GLs) | |||||||||
| Vancomycin (Va) | 3.3 (3) | 15.1 (14) | 81.8 (76) | 6.8 (6) | 20.3 (18) | 73.1 (65) | 0 (0) | 16.7 (9) | 83.4 (45) |
| Flouroquinolones (FQNs) | |||||||||
| Ofloxacin (Of) | 49.5 (46) | 8.7 (8) | 42 (39) | 79.8 (71) | 3.4 (3) | 16.9 (15) | 61.2 (33) | 38.9 (21) | 0 (0) |
| Norfloxacin (No) | 63.5 (59) | 24.8 (23) | 11.9 (11) | 83.2 (74) | 3.4 (3) | 13.5 (12) | 77.8 (42) | 22.3 (12) | 0 (0) |
| Tetracyclines (TCs) | |||||||||
| Doxycycline (Dx) | 88.2 (82) | 9.7 (9) | 2.2 (2) | 75.3 (67) | 18 (16) | 6.8 (6) | 100 (54) | 0 (0) | 0(0) |
| Oxytetracycline (OTC) | 59.2 (55) | 4.4 (4) | 36.6 (34) | 55.1 (49) | 0 (0) | 45 (40) | 70.4 (38) | 0 (0) | 29.7 (16) |
| Amphenicols (AMPs) | |||||||||
| Florfenicol (Fl) | 72.1 (67) | 3.3 (3) | 24.8 (23) | 76.5 (68) | 0 (0) | 23.6 (21) | 83.4 (45) | 0 (0) | 16.7 (9) |
| Overall | |||||||||
| Average (%) | 48.5 | 10.6 | 40.9 | 59.0 | 7.6 | 33.4 | 60.6 | 12.3 | 27.1 |
R = resistant; I = intermediate; S = susceptibility; n = number of isolates from each source; N: total number of isolates.