parasitology labs pdf - غير معروف

Parasitology

lab-14(Taenia solium)

1- Taenia solium:

((

pork tapeworm ))

1- habitat : small intestine (jejunum)

2- definitive host : man only

3- intermediate host : pig , man , sometimes dog and other animals

4- human can be intermediate host for T.solium , but only definitive host for T.saginata

5- human become intermediate host by the following ways :

1- Peristalsis in opposite side : regurgitation of the egg to the stomach Hcl

intestine  bile  release of oncosphere(larva) {{autoinfection}}

2- Human is carrier of adult  poor hygiene egg will contaminate the food (self

infection )

3- Restaurants workers poor hygiene  egg will contaminate the food

6- route of infection for man and animals : oral route

7- infective stage to animals : egg

8- infective stage to man : cysticercus cellulose in pork meat

9- life cycle :: adult in small intestine of man emberyonated egg+ segments in feces


egg and gravid segment on soil eaten by swine or (man )  larva (oncosphere) 

hatch in the intestine  penetration of the wall  go to blood  carried by blood to
other tissue cysticercus cellulose eaten by man (raw or insufficiently
cooked)evaginated scolex attach to mucosa adult in small intestine of man

10-adult :: scolex + hooks + suckers + neck + gravid segment  when gravid segment
separate from the body and go outside in feces so the egg will appear in the stool after
the rapture of gravid segment

11- Hcl of stomach + bile pigment => lead to rapture of cysticercus cellulose and
release of larva (oncosphere)

12- diagnosis : egg or gravid segment in stool

13- morphology :

1- Scolex : a- evaginated & invaginated

b- rostellum

c- double row of hooks

d- suckers

2-  Gravid segment : 7-13 branch of uterus
3-  Egg ( like the egg of T.saginata)
4-  Mature segment: a- square shape (but T.saginata = rectangle shape)

b- accessory lobe between the uterus and the other lobe
T.saginatabi-lobed T.soliumtri-lobed