The antibacterial activity of thiamphenicol was compared to that of chloramphenicol against 313 strains of gram-negative bacilli isolated from various clinical specimens. These two antibiotics were equally active against the 106 isolates of Haemophilus (MIC = 0.1–1.56 μg/ml) and against 40 strains of Bacteroides fragilis (almost all strains being inhibited by 12.5 μg/ml of the two drugs). In contrast, when compared with chloramphenicol, 2–16 times as much of thiamphenicol was required to inhibit Enterobacteriaceae, making prediction of the susceptibility of these strains to thiamphenicol on the basis of chloramphenicol testing alone likely to be hazardous. Disc diffusion test using 30-μg discs and 12 mm as cut-off point was a reliable technique to determine susceptibility of bacteria either to chloramphenicol or thiamphenicol. When thiamphenicol discs of greater potency (50 μg) were employed, many strains exhibited wide zones of inhibition although most of them were resistant by the agar dilution method (MIC > 12.5 μg/mL). This practice is not advisable for testing organisms isolated outside of the urinary tract.

Keywords:
Chloramphenicol, Thiamphenicol, Comparison, Enterobacteriaceae, MIC, Disc diffusion test
This content is only available via PDF.
© 1975 S. Karger AG, Basel
1975
Copyright / Drug Dosage / Disclaimer
Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher.
Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.
You do not currently have access to this content.