Faculty of Allied Medical Sciences Parasitology (MLPR-201) fall 2013/2014

Dr. Hamdy Badie M. El-Wakil Prof. of Parasitology & Public Health. Faculty of Allied Medical Sciences. Pharos University In Alexandria,Egypt

 By the end of this lecturer students should understand the classification, pathogenicity, clinical importance and clinical features,life cycle of Nematodes.

4 2- Phylum : Nemathelminthes Class : Nematodes The nematodes (round worms) are elongated, nonsegmented worms that are tapered at both ends. Unlike other helminthes, nematodes have a complete system, including a mouth, an intestine that spans most of the body length and an anus. The body is protected by a tough, noncellular cuticle. Most nematodes have separate, anatomically distinctive sexes.

5 The mode of transmission varies widely, depending on the species, and includes direct skin penetration by infections larvae, ingestion of contaminated soil, eating undercooked pork, and insect bites. The parasites can invade almost any part of the body: liver, kidneys, intestines, subcutaneous tissue, or eyes. Generally, nematodes are categorized by whether they infect the intestines as others tissues. Alternatively, they can be divided into those, for which the eggs are infectious, and those for which the larvae are infections. The most worldwide disease occurrence is ascariasis, caused by Ascaris lumbricoide

Family :Family : - Trichuridae e.g Trichuris trichiura (whip worm) (Trichuriasis) AscarididaeAscarididae Toxocara canis (Dog worm)Toxocara canis (Dog worm)(Toxocariasis) - Trichinellidae Trichinella spiralis (Trichinosis) Filariidae (Filarial worms)Filariidae (Filarial worms) (Blood & Lymphatic)(Blood & Lymphatic) Loa loa (Loiasis)Loa loa (Loiasis) Wuchereria bancroftiWuchereria bancrofti Wuchereria malayiWuchereria malayi (Filariasis or Elphantiasis)(Filariasis or Elphantiasis) 6 Phylum : Nemathelminthes (Round worms) Class : Nematoda Tissues infections Intestinal infections

StrongylidaeStrongylidae Strongyloides stercoralis (Small round worm)Strongyloides stercoralis (Small round worm)(Strongyloidiasis) DracunculidaeDracunculidae - Dracunculus medinensis- Dracunculus medinensis (Guinea fire worm) (Drancunculiasis)  Ancylostomidae Ancylostoma duodenale Necator americanus (Old world and New world hook worms) (Hookworm diseases) 7 Phylum : Nemathelminthes (Round worms) Class : Nematoda Tissues infections Intestinal infections

8 Phylum : Nemathelminthes (Round worms) Class : Nematoda Tissues infections Intestinal infections  Ascaridae - Ascaris lumbricoides (Giant round worm) (Ascariasis)  Oxyuridae - Enterobius vermicularis (Entrobiasis) (Oxyuriasis) Trichostrongylidae - Trichostrongylus colubriformis (Trichostrongyliasis)

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 Classify Class : Nematoda ?  Draw the life cycle of Ascaris lumbricoides, illustrating the infective stage and diagnostic stage ?

 Group of students will be selected for an assignment topic,one of the parasites that are studied in your course.  The following points should be covered in your assignment sheets:  Name, Description,  ( Morphological Characters in vivo) ,Geographic Distribution,  Habitat, Disease life cycle

 عاطف سعيد السيد بغدادي  عاطف كمال خميس علي خميس  عبد الباري ابرهيم عبد الباري ابو حسين  عبد الرحمن عوض حسين علي  احمد سامح فاروق عبد العظيم عريبه  محمد حمدي محمد عبد الشافي  محمد عصام علي حسين علي  خالد بهاء الدين محمود حسين

 عبد الفتاح محمد انور عبد الفتاح الرومي  عبد الله وجيه عبد الرؤوف احمد  عزيزه حسين عبد الحافظ حسين  علا حازم علي حسن