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Antimicrobial Agents and Chemotherapy, November 1998, p. 3032-3034, Vol. 42, No. 11
0066-4804/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Activity of HMR 3647 Compared to Those of Five Agents against Haemophilus influenzae and Moraxella catarrhalis by MIC Determination and Time-Kill Assay

Glenn A. Pankuch,1 Dianne B. Hoellman,1 Gengrong Lin,1 Saralee Bajaksouzian,2 Michael R. Jacobs,2 and Peter C. Appelbaum1,*

Departments of Pathology (Clinical Microbiology), Hershey Medical Center, Hershey, Pennsylvania 17033,1 and Case Western Reserve University, Cleveland, Ohio 441062

Received 6 July 1998/Returned for modification 17 August 1998/Accepted 25 August 1998

The microdilution MICs of HMR 3647, erythromycin A, azithromycin, clarithromycin, roxithromycin, and pristinamycin against 50/90% of 249 Haemophilus influenzae and 50 Moraxella catarrhalis isolates were 2/4, 0.06/0.125; 8/16, 0.25/0.25; 2/4, 0.06/0.125; 16/16, 0.25/0.25; 32/>32, 1/2; and 2/4, 0.5/0.5 µg/ml. Azithromycin was bactericidal against all 10 H. influenzae and 3 of 5 M. catarrhalis isolates and HMR 3647, erythromycin A, clarithromycin, roxithromycin, and pristinamycin were bacteriostatic, against all 15 strains after 24 h at the MIC.


* Corresponding author. Mailing address: Department of Pathology, Hershey Medical Center, 500 University Dr., Hershey, PA 17033. Phone: (717) 531-5113. Fax: (717) 531-7953. E-mail: pappelbaum{at}psghs.edu.


Antimicrobial Agents and Chemotherapy, November 1998, p. 3032-3034, Vol. 42, No. 11
0066-4804/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.



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