Changes

Taenia (view source)

Revision as of 09:25, 18 July 2010

71 bytes added , 09:25, 18 July 2010

no edit summary

Line 78: Line 78:

[[Image:T. saginata proglottid.jpg|thumb|right|150px|''T. saginata'' proglottid - Wikimedia Commons]]

[[Image:T. saginata.jpg|thumb|right|150px|''T. saginata'' - Wikimedia Commons]]

−

~~=== ''T. saginata'', the Beef Tapeworm of Humans ===~~

−

The adult in the human small intestine is unarmed, that is, no hooks on the scolex. Humans are infected by eating undercooked beef. Cattle are infected by ingesting eggs on pasture, or from contaminated utensils (e.g. calves from the milk-bucket). Transmission:

−

~~a) Direct: eggs reach pasture by direct deposition of human faeces~~

+

==''T. saginata''==

−

~~b) Indirect~~: by ~~use~~ of ~~sewage sludge on agricultural land~~

+

==Hosts==

+

'''Definitive host''': Man.

+

'''Intermediate host''': Cattle.

+

==Identification==

+

The adult is only found in humans, and is normally 5m in length, but may grow up to 3 times the length. The body is white and has a prominent anterior scolex, but no hooks.

+

The Proglottid has a thich outer shell, containing several hundred thousand eggs.

+

==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.

−

~~c) Birds: may transport whole proglottids from effluent outlets or, if they swallow the segment, pass the eggs with their droppings.~~

==== Cysticerci ====

Cmcory

1,377

edits