Parasitology
Lab-11 (A.duodenale+T.trichiura)
1- A.duodenale :
1-life cycle :: نفس النظريFilariform larva (( non feeding – 500 micron length ))
Rhabditiform larva (( feeding ))
2- habitat :duodenum
3- route of infection :: -- penetration of the skin -- contaminated food and drink
4- infective stage :
Filariform larva
5- diagnostic stage : egg contain undeveloped embryo in stool or adult worm
6- morphology : 1- Adult female is about 9-13 mm
2- The male is smaller than female 8-10 mm
3- The anterior end have buccal capsule armed with two ventral pairs
of teeth.
4- The posterior end of the male has copulatory bursa to attach the
female during the copulation, females have simple conical tail
7- morphology of egg ( )ال يوجد ساليد
oval shape
50 micron
outer thick shell
inner translucent shell
colorless
segmented to 4-8 blastomeres
8- clinical picture
) (نفس النظريin the late stage it cause anemia because it suck the
blood by the pairs of teeth - it cause 0.25 ml/worm/day of blood
) (هام
9- diagnosis :: stool examination (( see egg and adult worm ))
10 – treatment : Mebendazole – Albendazole
2- T.trichiura :
1- habitat : large intestine ( cecum and ascending colon )
2- life cycle : بالنظري
3- infective stage : developed egg ( contain larva )
4- diagnostic stage : egg in stool + adult
5- route of infection : feco-oral route
6- morphology : 1- female : 40-50 micron + anterior part like whip
2- male : 30-45 micron + anterior part like whip
3- posterior end : thick contain sex organ and intestine in female
pointed in male curved
7- morphology of egg ( )هام جدا1- lemon or barrel shape
2- 60 micron
3- two bulging ( protuberance )
4- outer shell
5- embryo
8- clinical picture ) (نفس النظريit cause anemia 0.005 ml/worm/day of blood
) (هام
9- diagnosis ::
stool examination (( see egg and adult worm ))
proctoscopy in rectal prolapse
10 - treatment : Mebendazole – Albendazole