. 2018 Mar 1;84(6):e02430-17. doi: 10.1128/AEM.02430-17

TABLE 4.

Percentages of bla_CTX-M-positive and bla_CTX-M-negative E. coli isolates resistant to a panel of 12 antibiotics

Antibiotic	Point estimate (% [95% CI])
Antibiotic	CTX-M-positive E. coli	CTX-M-negative E. coli
Amikacin	4.0 (1.7–9.0)	4.7 (2.2–10.0)
Amoxicillin-clavulanic acid	15.1 (9.9–22.3)	22.2 (15.8–30.2)
Ampicillin	99.2 (95.6–100)^a	38.9 (30.8–47.6)^a
Ceftiofur	99.2 (95.6–100)^a	13.4 (8.6–20.5)^a
Cephalothin	99.2 (95.6–100)^a	27.0 (20.0–35.3)^a
Chloramphenicol	52.3 (43.7–60.9)^a	30.2 (22.8–38.7)^a
Gentamicin	7.9 (4.4–14.0)	9.5 (5.5–15.9)
Nalidixic acid	35.7 (27.9–44.4)^a	7.9 (4.4–14.0)^a
Streptomycin	77.8 (69.8–84.2)^a	46.0 (37.6–54.7)^a
Sulfisoxazole	73.0 (64.7–80.0)^a	45.2 (36.8–53.9)^a
Tetracycline	86.5 (79.5–91.4)^a	51.6 (43.0–60.1)^a
Trimethoprim-sulfamethoxazole	66.7 (58.1–74.3)^a	27.8 (20.7–36.2)^a

Higher percentage of bla_CTX-M-positive isolates are resistant than bla_CTX-M-negative isolates.