1. Ecchinococcus granulosus
Tissue Cestodes
Ecchinococcus granulosus
Raed Z. Ahmed, Medical Parasitology Lab.,2012

3. Ecchinococcus granulosus
Ecchinococcus granulosus also known as hydatid worm.
Disease: Ecchinococcus (serious disease).
Adult lives in intestine of dogs but never in human intestine.
Definitive host: Dogs.
Dead end host: Human.
Intermediate host: sheep, cattle, horse, pigs.
Infective stage: ova by fecal oral route.
Diagnosis:
Tests involve antigen antibody reaction.
X-RAY examination.
Raed Z. Ahmed, Medical Parasitology Lab.,2012

4. Ecchinococcus granulosus stages
Raed Z. Ahmed, Medical Parasitology Lab.,2012

10. Horse liver

11. Diphyllobotherium latum
Intestinal Cestodes
Diphyllobotherium latum
Raed Z. Ahmed, Medical Parasitology Lab.,2012

12. Diphyllobotherium latum
knows as abroad fish tapeworm which can cause Diphylobotheriasis.
Mode of infection: through consumption of raw or undercooked fish contain plerocercoid larva.
Immature eggs are passed in feces of the mammal host (the definitive host).
After ingestion by a suitable freshwater crustacean (intermediate host), the coracidia develop into procercoid larvae.
Following ingestion of the crustacean by a suitable second intermediate host, the procercoid larvae are released from the crustacean and migrate into the fish's flesh where they develop into a plerocercoid larvae
The plerocercoid larvae are the infective stage for the definitive host (including humans).
Diagnosis:
Stool analysis to finding typical eggs ( oval, yellow brown with operculum at one end) and segments.
The scolex is the head portion of the worm, and is equipped with a slit-like groove (the bothrium) for attachment to the intestine.
Un embryonated egg passed in feces and become embryonated in water
Raed Z. Ahmed, Medical Parasitology Lab.,2012 12

14. Diphyllobotherium latum eggs
Raed Z. Ahmed, Medical Parasitology Lab.,2012

18. Raed Z. Ahmed, Medical Parasitology Lab.,2012
Intestinal Cestodes
Taenia spp.
Raed Z. Ahmed, Medical Parasitology Lab.,2012

20. Raed Z. Ahmed, Medical Parasitology Lab.,2012
Taenia spp.
Of the 32 recognized species of Taenia, only Taenia solium and Taenia saginata are medically important.
Taenia saginata, which is also known as the "beef tapeworm", though it also infects humans.
Taenia solium, which is known as the "pork tapeworm". Like Taenia saginata humans serve as its primary host.
Both have mature, immature and gravid segments.
Both have scolex provided with four cup- shaped suckers, but T. saginata has an unarmed scolex while T. solium has an armed scolex.
Raed Z. Ahmed, Medical Parasitology Lab.,2012

21. Raed Z. Ahmed, Medical Parasitology Lab.,2012
Taenia spp. (Cont….)
In both species the infective stage is the cysticercus.
Cows are the intermediate host of T. saginata while pigs are the intermediate host of T. solium.
Definitive host: Human.
Diagnosis:
By finding gravid proglotid or eggs in stool.
Eggs present in stool less often are proglottids.
Direct fecal smear.
Brine flotation technique.
Taenia saginata and Taenia solium must be differentiated from each other by the following:
Mature segment, gravid proglotid and adult worm.
Raed Z. Ahmed, Medical Parasitology Lab.,2012

22. Comparison Aspect Taenia saginata Taenia solium Intermediate host Cows
(Beef tape worm)
Pigs
(Pork tape worm)
Adult size
Longer ( 4 – 8 meters )
Smaller ( meters )
Number of segment
1000 – 2000
Mature segment
2 lobes ovary
3 lobes ovary
Gravid proglotid
With 15 – 30 uterine branches
With 7 – 13 uterine branches
Scolex
Devoid rostellum and hooks
With rostellum and 2 rows of hooks
Larvae
Cysticercus bovis in cattle only
Cysticercus cellulosae in pig as well as in man
Disease caused in man
Taeniasis
Taeniasis and cysticercosis
Raed Z. Ahmed, Medical Parasitology Lab.,2012

23. Raed Z. Ahmed, Medical Parasitology Lab.,2012
Taenia Egg
We can’t use egg to differentiate b/w two spieces
Raed Z. Ahmed, Medical Parasitology Lab.,2012

24. Raed Z. Ahmed, Medical Parasitology Lab.,2012
Taenia scolex
Taenia saginata
Taenia solium
Raed Z. Ahmed, Medical Parasitology Lab.,2012

25. Raed Z. Ahmed, Medical Parasitology Lab.,2012
Taenia mature segment
Taenia saginata
2 ovary lobes
Taenia solium
3 ovary lobes
Raed Z. Ahmed, Medical Parasitology Lab.,2012

26. Taenia Gravid Proglotid
Taenia saginata
Taenia solium
Raed Z. Ahmed, Medical Parasitology Lab.,2012

27. Raed Z. Ahmed, Medical Parasitology Lab.,2012
Taenia Adult worm
Taenia saginata
Taenia solium
Raed Z. Ahmed, Medical Parasitology Lab.,2012