Volume 10, Number 6—June 2004
Research
Antimicrobial Resistance among Campylobacter Strains, United States, 1997–2001
Table 2
Antimicrobial resistance among human C. jejuni strains, 1990–2001
Antimicrobial | % Resistant |
||||||
---|---|---|---|---|---|---|---|
1989-1990 (n = 286)a,b | 1997 (n = 209) | 1998 (n = 297) | 1999 (n = 294) | 2000 (n = 306) | 2001 (n = 365) | Total (n = 1,471) | |
Azithromycinc |
1 |
– |
1 |
3 |
2 |
2 |
2 |
chloramphenicol |
0 |
1 |
1 |
0.3 |
0 |
0 |
0.3 |
Ciprofloxacin |
0 |
12 |
14 |
18 |
14 |
18 |
16 |
Clindamycin |
1 |
1 |
1 |
1 |
1 |
2 |
1 |
Erythromycin |
1 |
1 |
2 |
2 |
1 |
2 |
2 |
Gentamicinc |
0 |
– |
0 |
0 |
0 |
0 |
0 |
nalidixic acid |
1 |
13 |
16 |
20 |
16 |
19 |
17 |
Tetracycline | 42 | 47 | 46 | 46 | 39 | 40 | 43 |
a1989–1990 U.S. sentinel county study used different sampling and laboratory methods (microbroth dilution testing) than NARMS (E-test). However, studies have concluded that broth microdilution and E-test give equivalent results for ciprofloxacin susceptibility testing of Campylobacter (44).
bIn 1989–1990 U.S. county study, only 285 isolates were tested for azithromycin and nalidixic acid susceptibility.
cFor azithromycin and gentamicin, only isolates received between 1998 and 2001 were tested (N = 1,262).