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| + | #REDIRECT[[:Category:Filarioidea]] |
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| − | {{toplink
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| − | |backcolour =
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| − | |linkpage =Parasites
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| − | |linktext =PARASITES
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| − | |pagetype=Bugs
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| − | |sublink1=Nematodes
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| − | |subtext1=NEMATODES
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| − | }}
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| − | <br>
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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.).
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| − | == General Appearance ==
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| − | *Non-bursate.
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| − | *Typically, they are long (up to 12cm or more), but filamentous.
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| − | *Live in connective tissues.
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| − | *(The most important veterinary species is ''Dirofilaria immitis'' which lives in the right heart and pulmonary arteries).
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| − | == General Life-Cycle ==
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| − | *The females of most species do not produce eggs, but instead they produce motile embryos ('''microfilariae''').
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| − | *Female worm → microfilariae → accumulate in blood or tissue fluid
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| − | → taken up by biting arthropod intermediate host
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| − | → L1 → L2 → L3
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| − | → enters wound
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| − | → larvae develop and migrate to predilection site in final host.
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| − | [[Dirofilaria immitis]]
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| − | [[Onchocerca spp.]]
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| − | [[Parafilaria spp.]]
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| − | [[Setaria spp.]]
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| − | [[Elaeophora scheideri]]
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| − | [[Stephanofilaria spp.]]
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| − | *''Filaroides osleri'' causes infection in [[Respiratory Parasitic Infections - Pathology#Filaroides osleri|trachea]]
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| − | *''Dirofilaria immitis'' live in heart and [[Respiratory Parasitic Infections - Pathology#Dirofilaria immitis|pulmonary arteries]] of dogs and cats
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