Difference between revisions of "Filarioidea"

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#REDIRECT[[:Category:Filarioidea]]
 
 
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[[Image:Dirofilaria immitus.jpg|thumb|right|150px|''Dirofilaria immitus'' - Courtesy of the Laboratory of Parasitology, University of Pennsylvania School of Veterinary Medicine]]
 
The filarial worms are of great importance in human medicine in the tropics, causing diseases such as elephantitis and river blindness, but their veterinary interest is limited - with the important exception of ''Dirofilaria'', the canine heartworm, which is a major cause of morbidity and death in warmer, humid regions (including parts of the USA, Australia, southern Europe etc.).
 
 
 
 
 
== General Appearance ==
 
*Non-bursate.
 
*Typically, they are long (up to 12cm or more), but filamentous.
 
*Live in connective tissues.
 
*(The most important veterinary species is ''Dirofilaria immitis'' which lives in the right heart and pulmonary arteries).
 
 
 
 
 
== General Life-Cycle ==
 
*The females of most species do not produce eggs, but instead they produce motile embryos ('''microfilariae''').
 
*Female worm → microfilariae → accumulate in blood or tissue fluid
 
 
 
→ taken up by biting arthropod intermediate host
 
 
 
→ L1 → L2 → L3
 
 
 
→ enters wound
 
 
 
→ larvae develop and migrate to predilection site in final host.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
[[Dirofilaria immitis]]
 
 
 
[[Onchocerca spp.]]
 
 
 
[[Parafilaria spp.]]
 
 
 
[[Setaria spp.]]
 
 
 
[[Elaeophora scheideri]]
 
 
 
[[Stephanofilaria spp.]]
 
 
 
*''Filaroides osleri'' causes infection in [[Respiratory Parasitic Infections - Pathology#Filaroides osleri|trachea]]
 
*''Dirofilaria immitis'' live in heart and [[Respiratory Parasitic Infections - Pathology#Dirofilaria immitis|pulmonary arteries]] of dogs and cats
 

Latest revision as of 11:20, 26 April 2010