Bacterial diseases Flashcards
Dermatophilosis causative agent
Dermatophilus congolense
D.congolense bacteria
2 morphological forms
1.filamentous hyphae
2.motioe zoospores
Transmission of Dermatophilosis
Direct contact
Contaminated environment
Biting insects
Pathogenesis of Dermatophilosis
Infective zoospores reach skin by getting attracted to CO2 and establish there
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Zoo-sores then form hyphae which invaginate the epidermis causing acute inflammatory condition
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In acutely conditions cases spontaneously recover within 2-4 weeks but in chronic cases scabbing occurs
Clinical signs of Dermatophilosis
Young immunosuppressed animal in high humidity
Pruritis
Scabbing ruining wool and beef quality
Presentation of cattle with Dermatophilosis
1.hair matted together as paint brush lesion
2.crust and scab formation which then coalesce
3.accumulation of keratinized material forming wart like lesions
Lesions seen on legs in animals standing in water or udder in dairy cattle
Presentation of sheep infected with Dermatophilosis
Pyramid shaped scabs attached to wool present on dorsal surface
Animal cannot be sheared
Foot rot—affects carpus or hock
Dermatophilosis histologically
Picture!1!!!
Diagnosis of Dermatophilosis
- Organism identified histologically
- Organism culture
- Indirect PCR, ELISA
- Most practical=cytologies exam of crusts and scabs stained with Giemsa or romanowski=RAILROAD TRACKS
Exudative epidermitis aka
Greasy pig disease
Ddx of Dermatophilosis
Contagious ecthyma
Lumpy skin disease in cattle
Pemphigus foliaceius
Dermatomycosis
Dermatophytosis
Greasy pig characteristics
Generalized dermatitis
5-60 day old pigs
Acute form in sucking pigs
Chronic form in weaned pigs
Greasy pig agent
Staphylococcus hyicus
S.hyicus
Cannot penetrate skin hence finds opportunity in cuts and abrasions caused day to day or even in mange mite infection
