Difference between revisions of "Dermatophilus congolensis"
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(Created page with '*Filamentous, branching actinomycete *Aerobic *Produces motile zoospores *No growth on Sabouraud dextrose agar *Dermatophilosis most prevalent in tropical and subtropical region…') |
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**Entrance after trauma or persistent wetting | **Entrance after trauma or persistent wetting | ||
**Activated zoospores produce germ tubes which develop into filaments which invade the epidermis | **Activated zoospores produce germ tubes which develop into filaments which invade the epidermis | ||
| − | **Invasion causes an accute inflammatory response with many [[Neutrophils | + | **Invasion causes an accute inflammatory response with many [[Neutrophils|neutrophils]] |
**Microabscesses are formed in the skin | **Microabscesses are formed in the skin | ||
**Raised crusts develop in the affected regions | **Raised crusts develop in the affected regions | ||
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*'''Clinical infections''': | *'''Clinical infections''': | ||
**Infection usually confined to epidermis | **Infection usually confined to epidermis | ||
| − | **Dermatophilosis | + | **[[Dermatophilosis]] |
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[[Category:Actinomycetes]] | [[Category:Actinomycetes]] | ||
| + | [[Category:To_Do_-_Bacteria]] | ||
Latest revision as of 10:08, 25 June 2010
- Filamentous, branching actinomycete
- Aerobic
- Produces motile zoospores
- No growth on Sabouraud dextrose agar
- Dermatophilosis most prevalent in tropical and subtropical regions
- Organisms found in scabs and in foci in skin of carrier animals
- Dormant zoospores become activated when moisture and temperature levels are favourable
- Zoospores may survive 3 years in scabs
- Pathogenicity:
- Does not usually invade healthy skin
- Entrance after trauma or persistent wetting
- Activated zoospores produce germ tubes which develop into filaments which invade the epidermis
- Invasion causes an accute inflammatory response with many neutrophils
- Microabscesses are formed in the skin
- Raised crusts develop in the affected regions
- Pathology
- Diagnosis:
- Giemsa-stained smears from scabs reveal branching filaments containing zoospores
- Immunofluorescence
- Scab material can be cultured on blood agar at 37 degrees centigrade, 2.5-10% carbon dioxide for 5 days
- Zoospores can be cultured
- After incubation, colonies are yellow and haemolytic (after 48 hours); they later become rough and yellow, and gain a mucoid appearance
- No growth on Sabouraud dectrose agar
- Clinical infections:
- Infection usually confined to epidermis
- Dermatophilosis