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Bacterial flora in psoriasis.

R Aly, H E Maibach, A Mandel

    The British Journal of Dermatology
    |December 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Psoriatic plaques harbor higher bacterial counts, including Staphylococcus aureus, compared to normal skin. Many S. aureus strains show penicillin resistance, posing a public health risk due to increased skin shedding.

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    Area of Science:

    • Microbiology
    • Dermatology
    • Public Health

    Background:

    • Psoriasis is a chronic inflammatory skin condition characterized by increased skin shedding.
    • The bacterial flora of psoriatic lesions is not fully understood.
    • Understanding skin microbiota is crucial for managing skin conditions and preventing infections.

    Purpose of the Study:

    • To investigate the aerobic bacterial flora on psoriatic plaques and compare it with uninvolved skin and anterior nares.
    • To determine the incidence and counts of Staphylococcus aureus and other bacteria in psoriatic patients.
    • To assess the antibiotic resistance patterns of isolated S. aureus strains.

    Main Methods:

    • Aerobic bacterial cultures were performed on skin swabs from psoriatic plaques, uninvolved skin, and anterior nares of 40 psoriatic patients.

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  • Bacterial identification and quantification were conducted.
  • Antibiotic susceptibility testing was performed on Staphylococcus aureus isolates.

    • Main Results:

    • Psoriatic plaques showed significantly higher total bacterial counts (7-9 x 10(3)/cm2) than uninvolved skin (3-0 x 10(3)/cm2).
    • Staphylococcus aureus incidence was 20% on plaques and 13% on uninvolved skin, with higher counts on plaques (3 x 10(2)/cm2).
    • Lipophilic diphtheroids were less common on plaques (4%) compared to normal skin (30%), and 80% of S. aureus strains were penicillin-resistant.

    Conclusions:

    • Psoriatic skin harbors a distinct aerobic bacterial flora with increased bacterial load and a higher prevalence of Staphylococcus aureus.
    • The high prevalence of penicillin-resistant S. aureus on psoriatic lesions is a concern.
    • Increased desquamation in psoriasis may contribute to its potential as a public health hazard.