Bacteriologic response to oral Cephalosporins: Are established susceptibility breakpoints appropriate in the case of acute otitis media?

Ron Dagan, Oren Abramson, Eugene Leibovitz, David Greenberg, Ruth Lang, Sivan Goshen, Pablo Yagupsky, Alberto Leiberman, Dan M. Fliss

Research output: Contribution to journalArticlepeer-review

120 Scopus citations

Abstract

Bacteriologic response to cefuroxime axetil and cefaclor administered for 10 days was evaluated in acute otitis media (AOM) in patients aged 6-36 months. Middle ear fluid culture was obtained by tympanocentesis before treatment, on day 4 or 5 after initiation of treatment, and if clinical relapse occurred before day 17. Bacteriologic failure was observed in 32% of patients receiving cefaclor versus 15% of patients receiving cefuroxime axetil (P = .009). Failure rates increased with increasing MIC: For Streptococcus pneumoniae, 0.5 μg/mL (established as cutoff value for cefuroxime by the National Committee for Clinical Laboratory Standards [NCCLS]) discriminated between success and failure. For Haemophilus influenzae, high failure rates were observed for cefaclor, even with low MICs (≤1.0 μg/mL), and with both drugs they tended to increase with increasing MIC, even for values below the cutoff suggested by the NCCLS (8.0 and 4.0 μg/mL for cefaclor and cefuroxime, respectively). Thus, for AOM caused by H. influenzae, lower susceptibility cutoff levels for MICs should be established.

Original languageEnglish
Pages (from-to)1253-1259
Number of pages7
JournalJournal of Infectious Diseases
Volume176
Issue number5
DOIs
StatePublished - 1 Jan 1997

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