Volume 8, Number 7—July 2002
Research
Antibiotic Resistance of Gram-Negative Bacteria in Rivers, United States
Ronald J. Ash*
, Brena Mauck*, and Melissa Morgan*
, Brena Mauck*, and Melissa Morgan*
Table 5
Resistance of ampicillin-resistant isolates to non-β–lactam antibioticsa
| Ampicillin-resistant isolates |
|||
|---|---|---|---|
| River | No. tested | Ampicillin + 1 (%) | Ampicillin >1 (%) |
| Arkansas-Little Rock, AR | 80 | 3 (3.7)a | 1 (1.2) |
| Arkansas-Witchita, KS | 155 | 31 (20) | 3 (1.9) |
| Canadian-Oklahoma City, OK | 42 | 6 (14) | 2 (4.7) |
| Chattahoochee-Atlanta, GA | 101 | 21 (20.8) | 2 (2.0) |
| Chicago-Chicago, IL | 100 | 43 (43) | 12 (12) |
| Colorado-Glenwood Springs, CO | 100 | 32 (32) | 24 (24) |
| Cuyahoga-Cleveland, OH | 79 | 28 (35.4) | 10 (12.6) |
| Des Moines-Des Moines, IA | 105 | 50 (47.6) | 8 (7.6) |
| Hudson-New York, NY | 108 | 20 (18.5) | 7 (6.5) |
| Kansas-Topeka, KS | 104 | 44 (42.3) | 2 (1.9) |
| Mississippi-New Orleans, LA | 42 | 10 (23.8) | 4 (9.5) |
| Mississippi-Minneapolis, MN | 115 | 19 (16.5) | 7 (6.0) |
| Mississippi-St. Louis, MO | 161 | 46 (28.8) | 10 (6.2) |
| Missouri-Parkville, MO | 182 | 30 (16.4) | 11 (6.0) |
| Ohio-Cincinnati, OH | 144 | 16 (11.1) | 4 (2.7) |
| Ohio-Louisville, KY | 141 | 22 (15.6) | 7 (4.9) |
| Ohio-Pittsburgh, PA | 54 | 14 (25.9) | 5 (9.2) |
| Ohio-Wheeling, WV | 50 | 2 (4) | 0 (0) |
| Platte-Grand Island, NE | 65 | 11 (16.9) | 3 (4.6) |
| Scioto-Columbus, OH | 59 | 10 (16.9) | 3 (5.0) |
| Wabash-Terre Haute, IN | 109 | 30 (27.5) | 12 (11) |
| White-Indianapolis, IN | 106 | 17 (16) | 5 (4.7) |
a Ampicillin + 1 = resistance to ampicillin and at least one non-β–lactam. Ampicillin >1 = resistance to ampicillin and 2 or more non-β–lactams. Non-β–lactam antibiotics tested: ciprofloxacin, tetracycline, chloramphenicol, kanamycin, and streptomycin.
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