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01.25.10 - Jan 25th Helminth Parasites Body Plans of...

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Jan 25 th Helminth Parasites Body Plans of Trematodes- no body cavity, diffusion no blood vessels, hermaphrodites (exception schistosomes) Life cycle- live in blood vessels, eggs passed into environment through human urine/feces, released as eggs which can infect snails (intermediate host), reach maturity and burst out as swimmers and burrow into skin of humans, tail falls off and schitosomulae live in blood which develop into adults that migrate to venules. Thus can interrupt transmission at snail level! Multiple intermediate hosts. Presently, drugs kill adults in human body. Human transport parasites when they move across world. Transmission of infection is dependent to some degree on host density and dispersal. We interrupt transmission at encounter filter – don’t allow people to come in contact with water contaminated with feces. Diagnostic of schistosomiasis- eosinophilia is common when infected by worms, continuing infection may cause granulomatous reactions (circle of attacking cells around invader); damages tissue which is
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