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.