TABLE 3.
Serotypes and antibiotic resistance patterns of Salmonella strains resistant to four or more antibioticsa
| Salmonella serotype (no. of strains) | Result for:
|
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AMC | AMP | FOX | TIO | AXO | CHL | GEN | KAN | NAL | STR | FIS | TET | |
| Agona (3) | R | R | R | R | I | s | S | s | s | s | R | R |
| R | R | R | R | I | R | S | R | R | R | R | R | |
| Dublin (6) | s | s | s | s | s | R | S | s | s | R | R | R |
| s | R | s | s | s | R | S | s | s | R | R | R | |
| s | R | I | s | s | R | I | R | s | R | R | R | |
| s | R | s | s | s | R | S | R | s | R | R | R | |
| R | R | R | R | s | R | S | s | s | R | R | R | |
| R | R | R | R | I | R | S | s | s | R | R | R | |
| Newport (3) | s | s | s | s | s | R | S | R | s | R | R | R |
| R | R | R | R | I | R | S | s | s | R | R | R | |
| R | R | R | R | I | R | R | R | s | R | R | R | |
| Reading (4) | R | R | R | R | s | R | S | s | s | R | R | R |
| Typhimurium (4) | I | R | s | s | s | R | s | s | s | s | R | R |
| R | R | R | R | I | R | s | s | s | R | R | R | |
| R | R | R | R | I | R | s | R | s | R | R | R | |
a
R, resistant; s, sensitive; I, intermediate (with MICs increased but below the resistance breakpoint value). Drug abbreviations are as follows, with breakpoint values in parentheses: AMC, amoxicillin-clavulanic (R ≥ 32 μg/ml); AMP, ampicillin (R ≥ 32 μg/ml); FOX, cefoxitin (R ≥ 32 μg/ml); TIO, ceftiofur (R ≥ 8 μg/ml); AXO, ceftriaxone (s ≤ 8 μg/ml, I = 16 to 32 μg/ml); CHL, chloramphenicol (R ≥ 32 μg/ml); GEN, gentamicin (R ≥ 16 μg/ml, I = 8 μg/ml); KAN, kanamycin (R ≥ 64 μg/ml); NAL, nalidixic acid (R ≥ 32 μg/ml); STR, streptomycin (R ≥ 64 μg/ml); FIS, sulfisoxazol (R ≥ 256 μg/ml); and TET, tetracycline (R ≥ 32 μg/ml).