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Bacteriology of pyoderma including anaerobes.

J Kishore, O P Singh, U Gupta

    The Indian Journal of Medical Research
    |July 1, 1989
    PubMed
    Summary

    Pyoderma infections commonly involve Staphylococcus aureus and beta-haemolytic streptococci (BHS). Many Staphylococcus aureus strains show resistance to erythromycin, impacting treatment options for these skin infections.

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    Area of Science:

    • Clinical Microbiology
    • Dermatology
    • Infectious Diseases

    Background:

    • Pyoderma, a common bacterial skin infection, necessitates understanding causative pathogens and their antimicrobial susceptibility.
    • Identifying prevalent bacterial strains is crucial for effective treatment strategies and infection control.

    Purpose of the Study:

    • To identify the primary bacterial pathogens isolated from pyodermal lesions.
    • To determine the antimicrobial sensitivity patterns of Staphylococcus aureus.
    • To characterize the typing of beta-haemolytic streptococci (BHS) isolates.

    Main Methods:

    • Culture and bacterial identification from 100 pus samples obtained from pyodermal lesions.
    • Antimicrobial sensitivity testing of isolated Staphylococcus aureus strains.
    • T-agglutination serotyping of beta-haemolytic streptococci isolates.

    Main Results:

    • A high positivity rate (99%) was observed in pus cultures.
    • Staphylococcus aureus (45%) and beta-haemolytic streptococci (32%) were the most frequent isolates.
    • Significant erythromycin resistance (38.3%) was noted in Staphylococcus aureus strains.
    • Group A BHS comprised 85.7% of typed BHS isolates; Groups G and D were also identified.
    • Obligate anaerobes, including Bacteroides melaninogenicus/asacchrolyticus, were found in mixed infections.

    Conclusions:

    • Staphylococcus aureus and beta-haemolytic streptococci are the predominant pathogens in pyoderma.
    • High erythromycin resistance in Staphylococcus aureus warrants careful antibiotic selection.
    • BHS typing provides epidemiological insights, while the presence of anaerobes highlights polymicrobial infection complexity.

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