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Taenia (view source)

Revision as of 15:28, 18 July 2010

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==''T. pisiformis''==
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{| cellpadding="10" cellspacing="0" border="1"
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| Also known as:
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| '''Cysticercus pisiformis
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|-
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|}
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=== ''T. pisiformis'' ===
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==Hosts==
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'''Definitive host''': Dogs and foxes.
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'''Intermediate host''': Rabbits and hares.
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==Identification==
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''T. pisiformis'' is around 2m in length, and have large scolexes and hooks.
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==Life Cycle==
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Infection of the intermediate host is through ingestion of the tapeworm eggs shed by the dogs.  The hatch in the small intestine of the intermediate host, they then continue to develop in the liver and the abdominal cavity.
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The definitive host is infected by ingestion of the cysticercus.  The prepatent period of ''T. pisinformis'' is around 7 weeks.
 
*It is similar to T. hydatigena, except that the cysticerci are pea-sized and are found on the omentum of rabbits.
 
*It is similar to T. hydatigena, except that the cysticerci are pea-sized and are found on the omentum of rabbits.
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=== ''T. multiceps'' (also known as Multiceps multiceps) ===
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==''T. multiceps''==
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*Widespread distribution in the UK; particularly common in parts of mid-Wales.
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*The eggs hatch in the small intestine of the sheep.
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{| cellpadding="10" cellspacing="0" border="1"
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*The oncosphere enters the blood stream and travels to the brain, where it migrates through brain tissue.
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| Also known as:
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*The metacestode (a coenurus) occurs inside the skull, lying on the surface of the brain.
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| '''Multiceps multiceps
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*It forms a 5cm long space occupying lesion.
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<br>
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*This leads to neurological signs, including gid – circling, ataxia and blindness.
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'''Coenurus cerebralis
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*It also causes softening of the skull above the lesion.
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<br>
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*If a whole proglottid is ingested, it can lead to acute encephalitis (very rare).
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'''Gid
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<br>
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'''Staggers
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|-
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|}
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==Hosts==
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'''Definitive host''': Dogs and foxes.
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'''Intermediate host''': Cattle, sheep, pig, horses and man.
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==Identification==
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''T. multiceps'' are around 5cm in length.
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==Life Cycle==
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The intermediate host is infected via ingestion of the parasite eggs.  These eggs hatch in the small intestine. The parasite the migrates to the spinal cord and brain via the blood stream. The definitive host becomes infected when it eats the spinal bord, or brain of the intermediate host.
       
=== ''T. serialis'' ===
 
=== ''T. serialis'' ===
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*The coenurus forms in intermuscular connective tissues of rabbits, often causing a soft subdermal swelling.  
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*Cases in pet rabbits probably originate from eggs shed by urban foxes.
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{| cellpadding="10" cellspacing="0" border="1"
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| Also known as:
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| '''Coenurus serialis
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|-
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|}
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==Hosts==
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'''Definitive host''':Dog.
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'''Intermediate host''': Rabbit.
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==Identification==
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''T. serialis'' is around 0.5m, with two prominent rows of hooks.
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==Life Cycle==
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The intermediate host is infected through ingestion of the tapeworm egg, which is shed by the dog, which acts as the definitive host.  These develop and form cysts in the intermuscular connective tissues of rabbits, often causing a soft subdermal swelling. .  The definitive host then becomes infected through ingestion of the metacestode.
    
== Taenia spp of the Cat ==
 
== Taenia spp of the Cat ==
 
[[Image:Taenia taeniformis.jpg|thumb|right|150px|Taenia taeniformis - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]
 
[[Image:Taenia taeniformis.jpg|thumb|right|150px|Taenia taeniformis - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]
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=== ''T. taeniaeformis'' ===
 
=== ''T. taeniaeformis'' ===
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*The metacestode appears as a pea-sized nodule in the liver of mice and other small rodents.
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*Cats will continue to become re-infected if they are hunters.
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{| cellpadding="10" cellspacing="0" border="1"
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| Also known as:
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| '''Hydatigera taeniaeformis
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<br>
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'''Taenia crassicollis
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<br>
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'''Cysticercus fasciolaris
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<br>
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'''Strobilocercus fasciolaris
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|-
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|}
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==Hosts==
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'''Definitive host''':  Cats, and foxes.
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'''Intermediate host''':  Mice, rats, rabbits, and squirrels.
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==Identification==
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The adult is around 70 cm, and has a large scolex.
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==Life Cycle==
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The eggs are past in faeces, which are ingested by the intermediate host.  The metacestode matures in the intermediate host, before being ingested by the definitive host.
    
[[Peritoneal Cavity - Parasitic Pathology]] inhabited by ''Taenia hydatigena'', ''Taenia pisiformis'', ''Taenia ovis''
 
[[Peritoneal Cavity - Parasitic Pathology]] inhabited by ''Taenia hydatigena'', ''Taenia pisiformis'', ''Taenia ovis''
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