Difference between revisions of "Ascaridoidea"

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(Redirected page to Category:Ascaridoidea)
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#REDIRECT[[:Category:Ascaridoidea]]
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{{unfinished}}
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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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== General Appearance ==
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[[Image:Toxocara cati.jpg|thumb|right|150px|''Toxocara cati'' - Laboratory of Parasitology, University of Pennsylvania School of Veterinary Medicine]]
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[[Image:Toxoscaris leonina.jpg|thumb|right|150px|''Toxoscaris leonina'' - Laboratory of Parasitology, University of Pennsylvania School of Veterinary Medicine]]
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[[Image:Toxocara canis.jpg|thumb|right|150px|''Toxocara canis'' - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]
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[[Image:Toxoscaris leonina 2.jpg|thumb|right|150px|''Toxoscaris leonina'' - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]
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*Non-bursate
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*Big fleshy worms; typically 5-40cm long (depending on age, sex and species)
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*Three lips around the mouth
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*A single-bulbed pharynx
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== General Life-Cycle ==
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*Adult females in small intestine lay eggs
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*Eggs have a thick protective shell
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*Some also have a sticky outer albuminoid coat
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*Eggs passed in faeces
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*L1 → infective L2 inside the egg
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*Infection is by ingestion of the embryonated egg (egg in which a larva has formed)
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*Eggs can remain viable in humid environment for up to 5 years
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*After hatching in the intestine, the larvae of most species (but not all) undergo hepato-tracheal migration:
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**egg hatches in intestine → larva penetrates intestinal mucosa → hepatic portal blood → liver → venous blood → heart → lung capillaries → alveoli → ascends trachea → swallowed → small intestine (where the adults develop)
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NOTE: there are important variations on this theme; for example, the migratory larvae of some species can cross
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the placenta or enter the mammary glands (examples of vertical transmission); while some species will utilise
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paratenic or intermediate hosts.
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[[Ascaridida]]
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Occlusion of pancreatic ducts sometimes happens [[Pancreas Parasitic - Pathology|Pancreas - parasitic]]
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In [[Peritoneal Cavity Parasitic - Pathology]]
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*''Parascaris equorum'' in [[Respiratory Parasitic Infections - Pathology#In Horses|rhinitis and lungs]]
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*Ascarid larvae in [[Muscles Inflammatory - Pathology#Nematodes|myositis]]

Revision as of 12:43, 9 January 2009



Infectious agents and parasitesWikiBugs Banner.png
PARASITES
NEMATODES



General Appearance

Toxocara cati - Laboratory of Parasitology, University of Pennsylvania School of Veterinary Medicine
Toxoscaris leonina - Laboratory of Parasitology, University of Pennsylvania School of Veterinary Medicine
Toxocara canis - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona
Toxoscaris leonina - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona
  • Non-bursate
  • Big fleshy worms; typically 5-40cm long (depending on age, sex and species)
  • Three lips around the mouth
  • A single-bulbed pharynx

General Life-Cycle

  • Adult females in small intestine lay eggs
  • Eggs have a thick protective shell
  • Some also have a sticky outer albuminoid coat
  • Eggs passed in faeces
  • L1 → infective L2 inside the egg
  • Infection is by ingestion of the embryonated egg (egg in which a larva has formed)
  • Eggs can remain viable in humid environment for up to 5 years
  • After hatching in the intestine, the larvae of most species (but not all) undergo hepato-tracheal migration:
    • egg hatches in intestine → larva penetrates intestinal mucosa → hepatic portal blood → liver → venous blood → heart → lung capillaries → alveoli → ascends trachea → swallowed → small intestine (where the adults develop)
NOTE: there are important variations on this theme; for example, the migratory larvae of some species can cross 
the placenta or enter the mammary glands (examples of vertical transmission); while some species will utilise 
paratenic or intermediate hosts.

Ascaridida

Occlusion of pancreatic ducts sometimes happens Pancreas - parasitic

In Peritoneal Cavity Parasitic - Pathology