Ref ID : 1608
W.J. Kelch and J.S. Lee; Antibiotic resistance patterns of gram-negative bacteria isolated from environmental sources. Appl.Environ.Microbiol. 36(1):450-456, 1978
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A total of 2,445 gram-negative bacteria belonging to fecal coliform, Pseudomonas, Moraxella, Acinetobacter, and Flavobacterium-Cytophaga groups were isolated from the rivers and bay of Tillamook, Oregon, and their resistances to chloramphenicol (25 mg/ml), streptomycin (10 mg/ml), ampicillin (10 mg/ml), tetracycline (25 mg/ml), chlortetracycline (25 mg/ml), oxytetracycline (25 mg/ml), neomycin (50 mg/ml), nitrofurazone (12.5 mg/ml), nalidixic acid (25 mg/ml), kanamycin (25 mg/ml), and penicillin G (10 IU/ml) were determined. Among fecal coliforms the bay isolates showed greater resistance to antibiotics than those from tributaries or surface runoff. No such well-defined difference was found among other bacterial groups. The antibiotic resistance patterns of gram-negative bacteria from different sources correlated well, perhaps indicating their common origin. The antibiotic resistance patterns of gram-negative bacteria of different genera also correlated well, perhaps indicating that bacteria which share a common environment also share a common mode for developing antibiotic resistance.