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. 2017 Apr 21;12(4):e0176379. doi: 10.1371/journal.pone.0176379

Table 3. MIC distribution and frequency of resistance (%R) among clinical Staphylococcus aureus isolated from horses (n = 53), dogs (n = 47), and cats (n = 17) in Australiab.

Antimicrobials Animals % R 95% CI Percentage of isolates with indicated MICa
≤0.004 0.008 0.016 0.03 0.06 0.13 0.25 0.5 1 2 4 8 16 32 ≥64
Amikacin Horse 9.4 3.1–20.7             1.9 1.9 3.8 43.4 24.5 15.1 7.5 1.9  
  Dog 2.1 0.1–11.3             2.1 2.1 6.4 36.2 46.8 4.3 2.1    
  Cat 0 0.0–19.5                   58.8 41.2        
Amoxicillin-clavulanate Horse (SSTI) 47.2 33.7–60.5           9.4 22.6 20.8 17 3.8 9.4 3.8 1.9 11.3  
Dog (SSTI) 59.5 43.3–74         7.1 14.3 19.1 9.5 14.3 19.1  2.4 14.3  
Dog (UTI) 0 0–0.5   60  40          
Cat 58.8 35.4–82.2         11.8   5.9 23.5 29.4 17.6       11.8  
Cefovecin Horse 13.2 5.5–25.3           3.8 3.8 7.5 66 5.7 1.9       11.3
  Dog 14.9 6.2–28.3         2.1 12.8 6.4 12.8 51.1     2.1     12.8
  Cat 17.6 3.8–43.4             5.9 35.3 41.2           17.6
Cefoxitin Horse 11.3 4.3–23.0           3.8 3.8 1.9 3.8 43.4 32.1     5.7 5.7
  Dog 12.8 4.8–25.7           10.6 10.6 2.1 4.3 38.3 21.3   2.1 2.1 8.5
  Cat 17.6 3.8–43.4                   29.4 52.9     5.9 11.8
Ceftriaxone Horse 13.2 5.5–25.3             1.9 1.9 9.4 15.1 58.5   1.9 11.3  
  Dog 12.8 4.8–25.7             2.1 8.5 12.8 17 46.8     12.8  
  Cat 17.6 3.8–43.4                 5.9 52.9 23.5     17.6  
Cephalothin Horse 11.3 4.3–23.0         5.7 3.8 35.8 32.1 9.4   1.9     5.7 5.7
  Dog 12.8 4.8–25.7         12.8 12.8 8.5 38.3 14.9     4.3     8.5
  Cat 11.8 1.5–36.4           5.9 17.6 41.2 17.6 5.9         11.8
Chloramphenicol Horse 1.9 0.0–10.1                     15.1 83     1.9
  Dog 2.1 0.1–11.3                 2.1   25.5 70.2     2.1
  Cat 0 0.0–19.5                     5.9 94.1      
Ciprofloxacin Horse 1.9 0.0–10.1         15.1 37.7 39.6 5.7       1.9      
  Dog 8.5 2.4–20.4         4.3 27.7 29.8 27.7 2.1     8.5      
  Cat 11.8 1.5–36.4             64.7 23.5       11.8      
Clindamycin Horse 0 0.0–10.1         20.8 77.4   1.9              
  Dog 2.1 0.5–14.5       2.1 34 59.6   2.1           2.1  
  Cat 0 0.0–19.5         47.1 52.9                  
Enrofloxacin Horse 1.9 0.0–10.1       1.9 32.1 54.7 9.4         1.9      
  Dog 8.5 2.4–20.4       2.1 8.5 53.2 23.4 2.1 2.1     8.5      
  Cat 11.8 1.5–36.4         11.8 52.9 23.5         11.8      
Marbofloxacin Horse 1.9 0.0–10.1         1.9 1.9 75.5 18.9       1.9      
  Dog 8.5 2.4–20.4         2.1 4.3 40.4 40.4 4.3     8.5      
  Cat 11.8 1.5–36.4             29.4 58.8       11.8      
Oxacillin Horse 11.3 4.3–23.0           17 37.7 30.2 3.8         1.9 9.4
  Dog 12.8 4.8–25.7         2.1 21.3 14.9 44.7 2.1 2.1       4.3 8.5
  Cat 17.6 3.8–43.4           11.8 23.5 47.1     5.9       11.8
Pradofloxacin Horse 1.9 2.4–20.4     13.2 52.8 30.2     1.9   1.9          
  Dog 8.5 2.4–20.4     4.3 17 46.8 23.4         6.4 2.1      
  Cat 11.8 1.5–36.4     5.9 17.6 64.7         5.9 5.9        
Rifampicin Horse 9.4 3.1–20.7 45.3 43.4 1.9               9.4        
  Dog 0 0.0–7.5 53.2 44.7     2.1                    
  Cat 0 0.0–19.5 35.3 64.7                          
Tetracycline Horse 32.1 19.9–46.3           30.2 28.3 9.4   1.9   1.9   5.7 22.6
  Dog 10.6 3.5–23.1         6.4 38.3 34 10.6   2.1       4.3 4.3
  Cat 5.9 0.1–28.7           47.1 47.1               5.9
Trimethoprim-sulfamethoxazole Horse 13.2 5.5–25.3             50.9 30.2 3.8 1.9 1.9 3.8 7.5    
Dog 6.4 1.3–17.5           2.1 44.7 38.3 4.3 4.3 4.3 2.1      
Cat 0 0.0–19.5         5.9 5.9 52.9 35.3              

a Among horse isolates, SSTI n = 53; dog isolates SSTI n = 42, UTI = 5; cat isolates SSTI n = 15, UTI n = 2.

b Unshaded areas show the dilution range for each drug.

Vertical solid lines indicate veterinary specific breakpoints.

Double vertical solid lines indicate human interpretative criteria.

ECOFFs are indicated as vertical dotted lines.

Resistance to CVN, FOX, CRE, CEF and OXA after confirmation of methicillin resistance status is presented in S2 Table.