Difference between revisions of "Stephanofilariasis"

Revision as of 10:23, 30 June 2010

Caused by Stephanofilaria stilesi
Occurs in cattle, buffalo, goats
Transmitted by flies
Affects ventral midline (other species affect different areas of body)
Grossly:
- Foci extending to large areas
- Errect hairs, epidermal haemorrhage, serum exudate -> crusts
Microscopically:
- Superficial and deep perivascular dermatitis
- Eosinophils, adult and microfilarial parasites
- Epidermal hyperkeratosis, parakeratosis, acanthosis, eosinophilic microabscesses and crusts

@@ Line 1: / Line 1: @@
-*Caused by [[Stephanofilaria stilesi|''Stephanofilaria stilesi'']]
+*Caused by [[Stephanofilaria spp.|''Stephanofilaria stilesi'']]
 *Occurs in cattle, buffalo, goats
 *Transmitted by [[Insecta|flies]]
@@ Line 10: / Line 10: @@
 **Eosinophils, adult and microfilarial parasites
 **[[Skin Glossary - Pathology|Epidermal hyperkeratosis, parakeratosis, acanthosis]], eosinophilic microabscesses and crusts
-===Gross pathology===
-*Lesions begin as small circular patches on the ventral midline with serous exudate.
-*These enlarge and coalesce producing lesions 25cm or more in diameter.
-*Hemorrhage develops along the periphery while the older, central areas develop scabs or dry crusts.
-*Healing lesions are alopecic, lichenified plaques.
-*Lesions may also occur on the flank, udder, teats, face and neck.
-===Histopathology===
-*Adult parasites occur within cystic diverticula of hair follicles or free within the adjacent dermis.
-**Parasites may have lateral cords and lateral cuticular projections.
-**The thick intestine is distinctive.
-**Microfilariae within uteri is the key feature.
-***Microfilariae also occur free within the dermis, in dermal lymphatics, or in the surface exudate.
-*There is little dermal reaction to adults in cystic hair follicles, but their presence within the dermis elicits eosinophilic and mononuclear inflammation.
-===Differential diagnosis===
-# Pelodera strongyloides:
-#*Rhabditid parasite, adults 1-1.5mm long, found in follicles
-#*uteri contain eggs, not microfilaria.
-# Dermatophytosis (Trichophyton verrucosum is most common)
-# Mange (Chorioptes bovis)
-# Fly bite dermatitis
-# Contact dermatitis
-# Zn-responsive dermatitis
-# Other subcutaneous filarid parasites:
-#*Parafilaria bovicola (adult worms 30-70mm long, found coiled in nodules in subcutaneous and intramuscular connective tissues; not seen in US)
-#*Onchocerca gutterosa (adult worms 60mm long, found in nuchal ligament and subcutaneous connective tissues).
-{{unfinished}}
-[[Category:Integumentary System - Helminth Infections]]
-[[Category:To_Do_-_Dermatology]][[Category:To Do - Minor]]

Difference between revisions of "Stephanofilariasis"

Revision as of 10:23, 30 June 2010

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