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| | | Taenia | | | Taenia |
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| − | == Taeniid Eggs ==
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| − | Have a striated “shell”, and are small (half the size of a strongyle egg). The six hooks of the tapeworm larva (oncosphere) are sometimes visible inside the egg. One or more gravid segments, each containing some 150,000-250,000 eggs, are shed daily and pass out of the anus. Eggs are released into the environment by the motile segments.
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| | == Taenia spp of Humans == | | == Taenia spp of Humans == |
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| | ==Life Cycle== | | ==Life Cycle== |
| | Eggs are past by the host, and survive on the pasture. The oncosphere is then ingested by the intermediate host, the cow in this case. These infect the striated muscle, which are visible as cysts. Humans become infected by ingestion of poorly cooked meat. | | Eggs are past by the host, and survive on the pasture. The oncosphere is then ingested by the intermediate host, the cow in this case. These infect the striated muscle, which are visible as cysts. Humans become infected by ingestion of poorly cooked meat. |
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| − | ==== Cysticerci ====
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| − | Grow to approximately 1cm long in the bovine intermediate host. If acquired during calfhood = survive; if acquired in later life eventually die = caseous = calcified. May be found in any striated muscle, but the highest densities are in heart and masseters.
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| − | ==== Epidemiology ====
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| − | May differ from place to place. For example:
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| − | - In the UK, very low prevalence in human population + generally high standards of sanitation = low transmission rate to cattle = low general prevalence in cattle = no herd immunity = sporadic “cysticercoid storms”.
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| − | - In East Africa, high prevalence in human population + lack of sanitation in rural areas = high rate of transmission to cattle = many calves infected = calfhood infection persists, but animals immune to reinfection.
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| | ==''T. solium''== | | ==''T. solium''== |
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| | == Taenia spp of the Dog == | | == Taenia spp of the Dog == |
| − | *Several species occur in dogs, varying in length from approximately 0.5-5m.
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| − | *Some species may also occur in the fox.
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| − | *The adults live in the small intestine and appear to cause little harm, but the exiting proglottids may cause pruritus.
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| − | *The prevalence of each species varies in different groups of dogs depending on their diet, that is, whether or not they have access to fresh meat, offal or rabbits.
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| − | *The prepatent period is generally 6-8weeks.
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| − | *It is important to differentiate the gravid proglottids of Taenia from those of Dipylidium. Taenia segments:
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| − | **are rectangular
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| − | **there is only one lateral genital pore
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| − | **the eggs are single (i.e. not in packets like Dipylidium)
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| | ==''T. ovis''== | | ==''T. ovis''== |
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| − | === ''T. serialis'' ===
| + | ==''T. serialis''== |
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| | {| cellpadding="10" cellspacing="0" border="1" | | {| cellpadding="10" cellspacing="0" border="1" |
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| | [[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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| | {| cellpadding="10" cellspacing="0" border="1" | | {| cellpadding="10" cellspacing="0" border="1" |
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| | ==Life Cycle== | | ==Life Cycle== |
| | 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. | | 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. |
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| − | [[Peritoneal Cavity - Parasitic Pathology]] inhabited by ''Taenia hydatigena'', ''Taenia pisiformis'', ''Taenia ovis''
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| − | *''Taenia solium'' and ''T.ovis'', ''T. saginata'', ''Multiceps serialis'' in [[Muscles Inflammatory - Pathology#Cestodes|myositis]]
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| | [[Category:Taeniidae]] | | [[Category:Taeniidae]] |
| | [[Category:To_Do_-_Max]] | | [[Category:To_Do_-_Max]] |