Related Experiment Videos
Pathogenesis of staphylococcal infections of the skin
Abstract:
Staphylococcus aureus does not grow readily on normal skin, where an important factor inhibiting its growth is the resident flora. Hydration of the stratum corneum favors the growth of S. aureus. Before lesions of staphyloderma are produced, organisms multiply on the surface. Substances produced as the result of multiplication enter the skin and produce an irritant reaction characterized by necrobiosis, spongiosis followed by perivascular infiltration, exocytosis and intraepidermal vesicle formation. A technique was used whereby the skin surface was separated from growing S. aureus by a filter. Pustules were produced through the filter.
Insights
Resident skin flora inhibits Staphylococcus aureus growth. However, skin hydration promotes S. aureus proliferation, leading to staphyloderma lesions through irritant reactions and pustule formation.
Area of Science:
- Microbiology
- Dermatology
- Infectious Diseases
Background:
- Normal skin harbors resident flora that prevents Staphylococcus aureus colonization.
- Stratum corneum hydration creates a favorable environment for S. aureus growth.
Purpose of the Study:
- To investigate the mechanism by which Staphylococcus aureus causes staphyloderma.
- To understand the role of bacterial multiplication products in skin irritation and lesion development.
Main Methods:
- Utilized a filter technique to separate the skin surface from growing S. aureus.
- Observed the effects of S. aureus multiplication products on skin tissue.
Main Results:
- Staphylococcus aureus multiplication on the skin surface precedes lesion formation.
- Substances produced by S. aureus induce irritant reactions including necrobiosis, spongiosis, and vesicle formation.
- Pustules were successfully produced even when the skin surface was separated from the bacteria by a filter.
Conclusions:
- Bacterial multiplication products, not direct bacterial invasion, are primarily responsible for initiating the irritant reaction in staphyloderma.
- The study elucidates the pathogenesis of staphyloderma, highlighting the role of bacterial metabolites in skin inflammation.