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In vitro susceptibility of gram-positive cocci to paldimycin

D J Pohlod, L D Saravolatz, M M Somerville

    Antimicrobial Agents and Chemotherapy
    |January 1, 1987
    PubMed

    Insights

    Paldimycin demonstrates antimicrobial activity against gram-positive cocci like staphylococci and streptococci. This new agent showed greater susceptibility compared to vancomycin in laboratory tests.

    Area of Science:

    • Microbiology
    • Infectious Diseases
    • Pharmacology

    Background:

    • Gram-positive cocci, including staphylococci and streptococci, are significant human pathogens.
    • The emergence of antibiotic resistance necessitates the development of novel antimicrobial agents.
    • Paldimycin (U-70138F) is a new antimicrobial compound with potential activity against these bacteria.

    Purpose of the Study:

    • To evaluate the in vitro antimicrobial activity of paldimycin against clinical isolates of staphylococci and streptococci.
    • To compare the efficacy of paldimycin with vancomycin, a standard treatment for gram-positive infections.

    Main Methods:

    • Minimum Inhibitory Concentrations (MICs) were determined for paldimycin against clinical isolates.
    • Testing was performed in Mueller-Hinton broth and nutrient broth.
    • Variables such as pH and inoculum size were assessed for their effect on MICs.

    Main Results:

    • Paldimycin exhibited activity against the tested gram-positive cocci.
    • MICs of paldimycin were higher in Mueller-Hinton broth compared to nutrient broth.
    • An inoculum effect was observed, indicating reduced efficacy with higher bacterial concentrations.
    • Gram-positive cocci were generally more susceptible to paldimycin than to vancomycin.

    Conclusions:

    • Paldimycin shows promising in vitro activity against clinical isolates of staphylococci and streptococci.
    • The susceptibility of these pathogens to paldimycin may be influenced by the growth medium and inoculum size.
    • Paldimycin represents a potential alternative antimicrobial agent for treating infections caused by gram-positive cocci.

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