Abstract
The susceptibility of 455Escherichia coli blood culture isolate to piperacillin was tested with the disk diffusion test. The presence of different beta-lactamase genes in these strains was also studied using DNA hybridization. Of the TEM beta-lactamase producing isolates, 64 % (61/95) were interpreted as intermediately susceptible to piperacillin. Because piperacillin is hydrolyzed by TEM-type beta-lactamases, we suggest that the intermediate susceptibility category should be reduced or omitted in testing piperacillin susceptibility ofEscherichia coli isolates.
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Arstila, T., Huovinen, S. & Huovinen, P. Problems in interpretation of piperacillin susceptibility of TEM-1 producingEscherichia coli in the disk diffusion test. Eur. J. Clin. Microbiol. Infect. Dis. 10, 1066–1067 (1991). https://doi.org/10.1007/BF01984931
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DOI: https://doi.org/10.1007/BF01984931