Parasitology
lab-13(Taenia saginata)
1- cestode
( )بشكل عام: morphology of adult (( head(scolex) – short neck –
mature segment – immature segment – gravid segment ))
2- Taenia saginata:
1- cause Taeniasis (beef tapeworm infection)
2-life cycle :: adult in small intestine embroynated egg after few weeks egg in
stool ( or gravid segment in the stool ) egg hatch into larva (oncosphere) in the
intestine and penetrate intestinal wall oncosphere in the muscles and other tissues
after 3 months oncosphere developed into cysticorcus bovis in the muscles
cysticorcus bovis eaten by man (in insufficiency cooked beef ) scolex attach to
mucosa of small intestine and developed into adult worm after 2-3 months adult in
small intestine repeat the cycle
3- habitat : small intestine (jejunum)
4- route of infection : mouth ( eating infected meat )
5- infective stage : cysticorcus bovis
6- source of infective stage : tongue of animals (cattle) that contain cysticorcus bovis
and it prevented by good cooking and deep freezing
7- cysticorcus bovis enter the body as invagenated scolex then converted to evagenated
scolex that attach to the small intestine .
8- evagenated scolex only in human
9- invagenated scolex in cattle and animals
10- definitive host : human
11- intermediate host : cattle , cow , ……..
12- Diagnosis : stool examination ( see egg , gravid segment )
13- clinical picture : abdominal pain , nausea , vomiting , intestinal obstruction and
appendicitis
14- treatment : niclosmide
15- morphology :
A- Adult : 1- white-gray color
2- (5-6) meter long
3- head contain 4 suckers without rostelum and without niclaic
4- scolex --- a: invagenated : scolex inside the cyst ( )غير موجود بالمختبر
b: evagenated : scolex outside the cyst ( )موجود بالمختبر
5- mature segment : two lobe of ovary – uterus – testes
6- immature segment
7- gravid segment : uterus contain eggs – 15-30 uterine branches
B- Egg : 1- small size (30-40M)
2- spherical or oval shape
3- covered by thick outer sheath
4- contain hexacanth embryo
5- have 6 hooklets
6- radially straight wall