This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Reprints and Permissions Copyright Information Books from ASM Press MicrobeWorld Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Goodwin, C. S. Articles by Hill, J. P. Search for Related Content PubMed PubMed Citation Articles by Goodwin, C. S. Articles by Hill, J. P.

 Previous Article  |  Next Article 

Antimicrob Agents Chemother. 1977 January; 11(1): 26-30
Copyright © 1977 American Society for Microbiology. All Rights Reserved.

Lysis of Enterobacteria by Cefoxitin, Cefuroxime, and Cephalothin

^a Division of Hospital Infection, Clinical Research Centre, Harrow, Middlesex HA1 3UJ, England

ABSTRACT

Cefoxitin, cefuroxime, and cephalothin were added to dense populations of beta-lactamase-producing enterobacteria, and the subsequent turbidity changes were monitored continuously. Viable counts and antibiotic assays were made at intervals after the addition of antibiotic, and the morphological appearances of the organisms were observed. Cephalothin caused lysis of most of the organisms tested, but even at high concentrations, after a few hours the antibiotic was destroyed and the organisms recommenced logarithmic growth. Cefoxitin produced lysis of all the strains of Escherichia coli and Klebsiella species tested, with supression of regrowth. With cephalothin and cefoxitin the viable counts after the addition of antibiotic correlated with the turbidity measurements. Cefuroxime infrequently caused lysis that suppressed multiplication, and the organisms became long and filamentous while the turbidity readings increased; the viable counts did not correlate with the turbidity measurements. Cefuroxime and cefoxitin were not destroyed by the beta-lactamases of any of the strains of enterobacteria that were studied.

¹ Present address: Microbiology Department, Royal Perth Hospital, Box X 2213, GPO Perth, Western Australia 6001.