Entamoeba histolytica Pathogenic (amoebic dysentery). Central endosome (karyosome). Regular distribution of peripheral chromatin. Trophozoite stage : amoeboid shape, metabolically active
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).
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)
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.
Taenia solium 4 sucker with rostellum and hooks
Taenia eggs # Eggs have embryo called : hexacanth embryo
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 )
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)
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.
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