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Intestinal Parasites. Intestinal protozoa Rhaizopode: Entamoeba histolytica, Entamoeba coli Flagellate: Giardia lamblia.

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Presentation on theme: "Intestinal Parasites. Intestinal protozoa Rhaizopode: Entamoeba histolytica, Entamoeba coli Flagellate: Giardia lamblia."— Presentation transcript:

1 Intestinal Parasites

2 Intestinal protozoa Rhaizopode: Entamoeba histolytica, Entamoeba coli Flagellate: Giardia lamblia.

3 Entamoeba histolytica Pathogenic (amoebic dysentery). Central endosome (karyosome). Regular distribution of peripheral chromatin. Trophozoite stage : amoeboid shape, metabolically active

4 Entamoeba histolytica Presence of RBC inside E. histolytica. Amoebic Dysentery penetrates the intestinal mucosa so cause bloody diarrhea. extra intestinal involvement ( abscesses in liver, lungs & rarely in brain).

5 Entamoeba histolytica cyst cyst stage: round shape, metabolically inactive, infective stage.

6 Entamoeba histolytica Life cycle

7 Entamoeba coli Non pathogenic. Eccentric karyosomes. Irregular peripheral chromatin. Cyst contain 8 nucleus.

8 Giardia lamblia Trophozoite pear shape, tennis rickets. 2 nuclei without peripheral chromatin. Pathogenic  Giardiasis.

9 Giardia lamblia Trophozoite contain 4 pairs of flagella. 2 sucking disc in the ventral part.

10 Giardia lamblia cyst ü Cyst stage:  Oval shape ( in amoeba it was round)  (1-4) nuclei. Mature cysts have 4 nuclei. Either 2 anterior & 2 posterior OR the 4 on the same side.

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12 Multicellular / worms 3 Types of worms : A. Cestodes B. Trematodes C. Nematodes Platyhelminthes

13 Cestodes: Taenia saginata (Beef tapworm) Taenia solium (Pork tapworm) Diphylobothrium latum. (fish worm)

14 Taenia saginata Cestode worm is composed of 3 parts: 1- scolex : responsible for the attachment to intestinal mucosa by suckers. 2- Neck: responsible for strobilization / production of body segments. 3- Body : compose of segments (proglottids)

15 It has 3 types of proglottids (segments) : 1-Immature: near the neck, 2- Mature : developing of sex organs occur. 3- Gravid : the segment is mature & uterus is filled with eggs.

16 Taenia solium 4 sucker with rostellum and hooks

17 Taenia eggs # Eggs have embryo called : hexacanth embryo

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19 Diphyllobothrium latum Intermediate host is fish infected with larva Scolex of D.latum: Has no suckers / instead it has 2 grooves called bothria ( di-phyllo-bothria )

20 D. latum gravid proglottides Gravid segment of D.latum Can appear in stool(like taenia) Width is more than the length Uterus has rossete shape ( no longitudinal branches like tinea)  Central genital pore (lateral in taenia)

21 D.latum Eggs : Like trematode eggs Oval shape Transparent, hasn ’ t thick wall Operculated: ( has a cap, the cap open so embryo will be released from egg.

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23 Comparison of Cestodes Taenia saginata Taenia solium Diphyllobothrium latum Scolex Sucking Disks Only Sucking Disks Plus a Rostellum with Hooklets Sucking Grooves (Bothria) Proglottid Longer than it is Wide Longer than it is Wide Wider than it is Long Uterus Lateral Branching > 13 Branches (About 16) Lateral Branching < 13 Branches (About 8) Rosette in Shape Genital Pore Located on the Lateral Margin Located on the Lateral Margin Located Centrally

24 Trematodes 1. Clonorchis sinensis: Distinctive membrane Shouldered operculum Has posterior projection

25 Heterophyes heterophyes Same characteristics of C.sinesis eggs but NOT shouldered operculum

26 Fasciolopsis buski found in intestine  3.5 cm in length Fasciola hepatica found in the liver or bilary duct. 3 cm in length.

27 Schistosoma mansoni Separate sexes Lateral spine

28 Nematodes

29 Enterobius vermicularis. *intestinal worm, small size, cause anal itching at night (mostly in children ). * Transparent egg: Presence of larva stage inside egg

30 Trichuris trichura * Lemon shape * 2 mucus blugs one at each side of egg.

31 Ascaris lumbricoides The egg : When fertilized, it will form mucus membrane ( vitelline membrane ) at the outer surface.

32 Hookworms ( Ancylostoma duodenale, Necator americana) ü Hook worm egg (found in stool):  It has cell stage embryo (form multiple cells

33 Strongyloides stercoralis the larva stage NO EGG Male : smaller than female, has pointed curved end Female : larger,straight tail

34 THANK YOU


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