Table 2.
Antimicrobial susceptibility and resistance of Bacteroides fragilis group to selected antimicrobials from 2010 to 2012.
| Percent susceptible (%S) and percent resistant (%R)b | A/Sa |
P/T |
FOX |
ETP |
IPM |
MEM |
CC |
MXF |
MTZ |
||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| N |
%S |
%R |
N |
%S |
%R |
N |
%S |
%R |
N |
%S |
%R |
N |
%S |
%R |
N |
%S |
%R |
N |
%S |
%R |
N |
%S |
%R |
N |
%S |
%R |
|
| Breakpoints in μg/mL | – | ≤8/4 | ≥32/16 | – | ≤32/4 | ≥128/4 | – | ≤16 | ≥64 | – | ≤4 | ≥16 | – | ≤4 | ≥16 | – | ≤4 | ≥16 | – | ≤2 | ≥8 | – | ≤2 | ≥8 | – | ≤8 | ≥32 |
| B. fragilis | 768 | 90 | 3 | 1497 | 98 | 1 | 1403 | 87 | 3 | 770 | 97 | 2 | 234 | 98 | 1 | 1503 | 96 | 1 | 1423 | 72 | 23 | 769 | 65 | 26 | 1503 | 96 | 2 |
| B. thetaiotaomicron | 349 | 80 | 4 | 467 | 79 | 8 | 469 | 48 | 8 | 348 | 98 | 1 | 134 | 99 | 1 | 470 | 98 | 1 | 469 | 32 | 55 | 348 | 47 | 34 | 470 | 100 | 0 |
| B. ovatus | 77 | 88 | 1 | 127 | 95 | 4 | 130 | 58 | 9 | 77 | 95 | 1 | 52 | 100 | 0 | 130 | 98 | 0 | 129 | 43 | 46 | 77 | 32 | 40 | 130 | 99 | 0 |
| B. vulgatus | 106 | 70 | 5 | 174 | 97 | 2 | 153 | 82 | 7 | 106 | 99 | 1 | 56 | 100 | 0 | 153 | 98 | 1 | 152 | 47 | 52 | 92 | 20 | 76 | 174 | 100 | 0 |
| B. uniformis | 94 | 88 | 4 | 128 | 95 | 2 | 129 | 60 | 9 | 94 | 100 | 0 | 24 | 100 | 0 | 128 | 99 | 0 | 121 | 44 | 40 | 94 | 27 | 53 | 128 | 99 | 0 |
| B. eggerthii | 60 | 93 | 0 | 70 | 89 | 11 | 73 | 34 | 21 | 60 | 100 | 0 | – | – | – | 72 | 100 | 0 | 72 | 29 | 63 | 61 | 25 | 38 | 72 | 100 | 0 |
| Parabacceroides distasonis | 220 | 66 | 20 | 265 | 56 | 30 | 265 | 42 | 15 | 220 | 97 | 2 | 33 | 97 | 0 | 265 | 97 | 2 | 265 | 25 | 57 | 220 | 69 | 27 | 265 | 100 | 0 |
| B. fragilis group without B. fragilis | 906 | 78c | 8 | 1231 | 81 | 11 | 1219 | 53 | 10 | 905 | 98 | 1 | 299 | 99 | 0 | 1218 | 98 | 1 | 1208 | 35 | 53 | 892 | 45 | 40 | 1239 | 100 | 0 |
| All 7 species listed | 2580 | 82 | 6 | 3959 | 87 | 7 | 3841 | 65 | 7 | 2580 | 98 | 1 | 832 | 99 | 1 | 3939 | 98 | 1 | 3839 | 48 | 42 | 2553 | 51 | 36 | 3981 | 98 | 1 |
a
The following antimicrobials were used: Ampicillin-sulbactam (A/S), Piperacillin-Tazobactam (P/T). Cefoxitin (FOX), Ertapenem (ETP), Imipenem (IPM), Meropenem (MEM), Clindamycin (CC), Moxifloxacin (MXF), Metronidazole (MTZ).
b
Intermediate category is not shown, but can be derived by subtraction of %S and %R for each antimicrobial agent from %100.
c
Underlined values designate significant changes in %S and %R compared to Table 1 data as determined by chi-square test.