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HELMINTI PARAZITI Subincrengatura Plathelminti Clasa Trematoda Fasciola hepatica Clasa Cestoda Fam. Taeniidae Taenia solium Taenia saginata Taenia echinococcus Fam. Diphyllobothridae Diphyllobothrium latum Fam. Hymenolepidae Hymenolepis nana
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Viermi plati-caracteristici generale
Turtire dorso-ventrala Simetrie bilaterala Lipsa cavitatii generale Lipsa tubului digestiv hermafroditi
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Clasa Trematoda-caracteristici:
Organ de fixare cu ventuze; Organe genitale dezvoltate; Paraziti permanenti; Infectii rar intalnite la om
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Fasciola hepatica(Distomum hepaticum)
Boala – fascioloza Boala parazitara grava, frecventa la cornute Parazit localizat in caile biliare: da tulburari
hepatice grave
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Virmele de galbeaza :adulti si oua
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Stadii de dezvoltare
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Gazde
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Consecinte clinice;
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Clasa Cestoda-caracteristici
Corp alcatuit dintr-un numar mai mare sau mai mic de segmente
Fiecare segment are organizare hermafrodita Organe de fixare:ventuze si coroane de
carlige Hranirea prin osmoza Prezinta o gazda intermediara
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Fam. Taeniidae Taenia saginata
6-8 m lungime;albicios Alcatuire: scolex, gat, strobila (totalitatea
proglotelor, 1000-1500 segmente); Cisticerc=larva de tenie dezvoltata din
embrionul hexacant Boala se numeste teniaza
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Tenia vacii: adult si oua
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Gazde
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Modalitati de transmitere
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Consecinta clinice
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Tenia solium
3-5 m lungime; Scolex mic cu 4 ventuze si o coroana dubla
de carlige; Nu depune oua;elimina proglotele batrane
pline cu oua odata cu fecalele Cisticerci=larve vezicularein muschii
masticatori, pericard, muschii gatului, pieptului, muschiul limbii
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Tenia porcului:adult si oua
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Stadii de dezvoltare
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Modalitati de transmitere
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Consecinte clinice
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Tenia cainelui (Taenia echinococcus)
Boala provocata: hidatidoza (chist hidatic); Gazde obisnuite: caine , pisica, lup, vulpe; Chisturile au diverse localizari: plamani, ficat; Cestod foarte mic 3-6 mm (3-4 proglote); O complicatie a bolii este hidatidoza
secundara
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Adultul, ouale, larvele
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Fam. Diphyllobothridae
Boala se numeste botriocefaloza; Cel mai mare cestod al omului :
Diphyllobothrium latum, 5-10 m;(botriocefalul)
strobila cu 3-4000 proglote, ce elimina ouale pe masura ce le formeaza;
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Increngatura Nemathelminti
Clasa Nematode Fam. Trichinellidae Trichinella spiralis Fam. Ascarididae Ascaris lumbricoides Fam. Oxyuridae Oxyuris vermicularis
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Viermi cilindrici
Fam. Ancylostomidae Ancylostoma duodenale Fam. Rhabditidae Strongyloides stercoralis
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Limbricul
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Consecinte clinice
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Ascaris lumbricoides
Nematod alb-galbui sau roz, cu capete ascutite; cel mai lung vierme cilindric al omului (femela 20-25 cm);
La extremitatea anterioara are trei buze dintate si proeminente;
Tub digestiv complet; Femela depune zilnic 200 000 oua
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Hookworm(Ancylostoma )
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Adultul si oul
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Consecinte clinice
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Threadworm(Strongyloides)
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Caracteristici:
Nematod foarte mic; Prezinta doua forme: una libera si una
intestinala; Sursa de infectare e omul bolnav in fecalele
caruia se gasesc larvele infectante
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Enterobius vermicularis (Oxiurul)Adultul si ouale
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Consecinte clinice