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Cefsulodin was evaluated as a potential selective agent for aeromonads. Resistance of Aeromonas and coliform isolates was determined by using a standard disk diffusion technique. A total of 119 Aeromonas and 78 coliform strains were isolated. For 102 of 130 [corrected] Aeromonas isolates (environmental and reference strains), the MIC of cefsulodin was   32 micrograms/ml. Because cefsulodin suppresses growth of Aeromonas and other oxidase-positive organisms, total coliform (TC) and Escherichia coli counts on Chromocult Coliform agar (CC agar) without cefsulodin and on CC agar with 10 mg of cefsulodin per liter (CC-CFS) were compared. Variance analysis of data from 14 sewage-polluted irrigation water specimens did not demonstrate any statistically significant difference in the enumeration of E. coli with CC and CC-CFS media. On average, the CC agar recovered 2.46 times as many TCs as CC-CFS. However, Aeromonas colonies made up an average of 58.6% of the TC counts on CC agar. Because no Aeromonas spp. were recovered on CC-CFS, background interference was eliminated and the counts that were obtained reflected more accurately the number of TCs. Results of this study suggest that cefsulodin may be a useful selective agent against Aeromonas spp. which should be included in coliform chromogenic media when high levels of accompanying flora are expected.

Differential susceptibility of aeromonads and coliforms to cefsulodin