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march 28 2012- dr. ndao.docx

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Microbiology and Immun (Sci)
MIMM 413

thWednesday March 28 2012This disease is endemic in all countries in the world where they raise pigs When humans defecate outside the pigs eat human feces and this is how they get infected This can be up to 8 meters Also with this worm the adult is in the human In other hydatid diseases humans get infected by the oocystEpidemiology How the life cycle of the parasite is maintained They can release the eggs thick can survive for months or parts of the worm in feces This parasite can also spread with contact from human to human Also when people eat undercooked meat or pork containing the larvae this can infect people as well Parasites can form cysts in the pork It is hard to diagnose by looking at the stool of the people Most people are diagnosed by MRI xray So this disease was underreported until 1990 when people got access to xrays and CT scansPrevalence of T solium Infection Some parts of South and Central America and subsaharan Africa and Asia are infected It is also prevalent in some Eastern countries in EuropePork Tapeworm Scolex neck and proglottid has eggs Remember hydatic can release up to 1000 eggs T solium causes neurocysticercosis mainly When people have the disease they can release gravid proglottids which can have up to 50000 eggs inside These proglottids have male and female inside This is opposite to others this is very short The hydatid is localized mainly in the liver and the lungs The form we have up north is mainly in the lungs This worm invades the GI tract and forms a cyst in the muscles Based on this life cycle if you do not eat pork you can still get infected from soil It was demonstrated in New York that Jewish Orthodox people got infected they never eat porkHere the adult and the larvae is in the host definitive hosthuman But for hydatid the definitive host are dogs Adult Worm The proglottids come from under the scolex Cestode Tegument EM Section There is no GI tract in the worm and the adult lives in the small intestine of humans The tegument is very compact The nutrients get inside the taenia by pinocytosis
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