Difference between revisions of "Habronema and Draschia spp."

Revision as of 22:10, 25 June 2010

Spiruroids occurring in stomach:
- Habronema microstoma - worldwide.
- Draschia megastoma - tropical/sub-tropical climates.

Indirect LC, muscid fly intermediate hosts.
Adults under layer of mucous in stomach (Habronema) or in large nodule (Draschia).
Elongated embryonated eggs (50-60µm) passed in faeces.
L1 ingested by fly larvae - develop to L3 as fly matures.
L3 deposited on horse's lips as fly feeds - swallowed - mature to adult worms.
Prepatent period = 2months.
Larvae → "cutaneous habronemosis" or "summer sores":
- larvae laid on skin wound → large granulomata
- seasonal incidence
- affected horses may be difficult to work.

Adult worms:
- Habronema - mild gastritis (no mucosal invasion)
- Draschia - tumour-like nodules may impair pyloric function.

Regular anthelmintic treatment (adults - not required; larvae - ivermectin).
Cover or turn over dung heaps (to prevent access of flies to breeding sites or kill by composting).

@@ Line 19: / Line 19: @@
 **seasonal incidence
 **affected horses may be difficult to work.
-The adult nematode lives in the stomach of the horse and produces eggs which are then passed in the faeces and hatch into larvae. The larvae are ingested by the [[Musca spp.|house fly]] (''Musca domestica'') or [[Stomoxys calcitrans|stable fly]] (''Stomoxys calcitrans'') in their larval phase, and deposited on equine skin when they feed as adult flies.
 ==== Pathogenicity ====
@@ Line 31: / Line 28: @@
 *Regular anthelmintic treatment (adults - not required; larvae - ivermectin).
 *Cover or turn over dung heaps (to prevent access of flies to breeding sites or kill by composting).
-Cause [[Habronemiasis, Cutaneous]]
-==Test yourself with the Horse Nematode Flashcards==
-[[Horse_Nematode_Flashcards|Horse Nematode Flashcards]]
 [[Category:Spiruroidea]][[Category:Horse_Nematodes]][[Category:To_Do_-_Parasites]]