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→''Dermatophilus congolensis''
*Dormant zoospores become activated when moisture and temperature levels favourable
*Dormant zoospores become activated when moisture and temperature levels favourable
*Zoospores may survive 3 years in scabs
*Zoospores may survive 3 years in scabs
*Pathogenicity:
*'''Pathogenicity''':
**Does not usually invade healthy skin
**Does not usually invade healthy skin
**Entrance after trauma or persistent wetting
**Entrance after trauma or persistent wetting
**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
*Diagnosis:
*[[Skin - infectious#Dermatophilosis|'''Pathology''']]
*'''Diagnosis''':
**Giemsa-stained smears from scabs reveal branching filaments containing zoospores
**Giemsa-stained smears from scabs reveal branching filaments containing zoospores
**Immunofluorescence
**Immunofluorescence
**After incubation, colonies are yellow and haemolytic (after 48 hours); they later become rough and yellow, and gain a mucoid appearance
**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
**No growth on Sabouraud dectrose agar
*Clinical infections:
*'''Clinical infections''':
**Infection usually confined to epidermis
**Infection usually confined to epidermis
**Dermatophilosis
**Dermatophilosis
**Scab formation more prominent in sheep and cattle than in horses
**Scab formation more prominent in sheep and cattle than in horses
**Lesions may resolve within weeks if dry weather, or may progress
**Lesions may resolve within weeks if dry weather, or may progress
*Treatment:
*'''Treatment''':
**Parenteral antibiotics e.g oxytetracycline, pr penicillin-streptomycin combinations
**Parenteral antibiotics e.g oxytetracycline, pr penicillin-streptomycin combinations