Difference between revisions of "Parafilaria spp."

Revision as of 22:39, 26 April 2010

Filarial nematode (<6cm long).
Subcutaneous nodules and intermuscular connective tissue.
Found in warmer countries (Asia, Africa, Europe, South America; UK in imported horses only).

Indirect LC, horn fly (Haematobia) intermediate host.
Female worms perforate nodules and lay eggs on skin surface; hatch to L1.
Fly ingests L1 during feeding, develops to L3 inside fly.
New host infected when fly feeds on skin wound, L3 enters and matures to adult worm.
Prepatent period = 8-10months.

Female worm punctures skin to lay eggs - bleeding points ("sweating blood"); most active in warm weather after horse exercised.
Lesions only temporary, though reappear the following spring (worms live several years).

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+=== ''PARAFILARIA'' SPECIES ===
+==== General ====
+*Filarial nematode (<6cm long).
+*Subcutaneous nodules and intermuscular connective tissue.
+*Found in warmer countries (Asia, Africa, Europe, South America; UK in imported horses only).
+==== Life-Cycle ====
+*Indirect LC, horn fly (''Haematobia'') intermediate host.
+*Female worms perforate nodules and lay eggs on skin surface; hatch to L1.
+*Fly ingests L1 during feeding, develops to L3 inside fly.
+*New host infected when fly feeds on skin wound, L3 enters and matures to adult worm.
+*Prepatent period = 8-10months.
+==== Pathogenicity ====
+*Female worm punctures skin to lay eggs - bleeding points ("sweating blood"); most active in warm weather after horse exercised.
+*Lesions only temporary, though reappear the following spring (worms live several years).
 [[Category:Filarioidea]]
+[[Category:Horse_Nematodes]]