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Updated: Oct 28, 2026

Production and Testing of Antimicrobial Peptides and Their Mimics
Published on: April 10, 2026
In-vitro activity of the new ketolide antibiotic HMR 3647 against gram-positive bacteria
T Schülin1, C B Wennersten, R C Moellering
1Department of Medicine, Beth Israel Deaconess Medical Center, and Harvard Medical School, Boston, MA 02115, USA.
Abstract:
The comparative in-vitro activity of HMR 3647, a new ketolide antibiotic, was investigated against 492 clinical isolates of gram-positive bacteria, including multiply resistant strains, by an agar-dilution technique. All streptococci tested were inhibited by the new ketolide at concentrations < or = 0.5 mg/L. HMR 3647 was more potent than erythromycin against staphylococci. For enterococci the new compound yielded an MIC90 of 8 mg/L. Erysipelothrix spp., Pediococcus spp., Leuconostoc spp., Lactobacillus spp., JK diphtheroids and Listeria monocytogenes were also susceptible to the new ketolide.
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