
Parasitology
Lab-17 (Schistosoma haematobium)
1- Trematodes :
Intestinal flukes Heterophyes heterophyes
Liver flukes Fasciola hepatica
Pulmonary flukes Paragonimus westermani
Blood flukes Schistosoma
2
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Schistosoma haematobium :
1- definitive host : man
2- intermediate host : snail bulinus
3- habitat : vesical plexus (veins) around the bladder
4- infective stage to man : cercaria
5- diagnostic stage to man : egg ( urine examination )
6- route of infection : skin penetration - oral route
7- life cycle
غير هام
((adult in the intestine of man embryonated egg in small
intestine embryonated egg pass into lumen of bladder , out with urine into water
Miracardium haches from egg , penetrate snail in the snail mother sporocyst
daughter sporocyst cercaria cercaria leave snail into water cercaria penetrate skin
of man carried by blood to the heart lungs heart portal vessels immature
worm become mature worm migrate back to vesical veins repeat the cycle ))
8- morphology :
Adult :
1- Have separate sexes ( male and female )
2- Elongated parasite , leaf shape
3- Anteriorly it is attached to the host by ventral suckers
4- Female : longer – narrower – smooth body
5- Male : shorter – wider – body has granulations – folded body
6- They have oral and ventral suckers – mouth – pharynx - esophagus – intestine
7- The intestine end in blind loop
8- Black color of worm body due to digestion of blood

9- GIT : have two branches that fuse to make one canal
10- Male : have 3-5 testes opposite to ventral suckers
11- Female : has ovary infront of the reunion of intestine
( ovary located posteriorly – red color )
12- Female : from ovary to the end of the body there are vitellaire glands
Egg :
1- Oval
2- Large
3- No operculum
4- Contain fully developed Miracardium
5- Have terminal spine
Miracardium:
1. Swim very rapid searching for snails
2. Covered by cilia
Cerearia :
1. Bifurcated tail
2. Has body
3. After penetration of skin , it will lose its tail
4. Could enter through mouth or skin
9 – Symptoms : Cough &hemoptysis - Febrile reaction - Eosinophilia - Terminal
hematuria - Dysuria - frequency of micturition - Suprapubic pain - pyurea
10 - Diagnosis :
Urine examination ( see egg ----- do the test after exercise )
Biopsy
Clinical picture
Blood examination ( eosinophilia – increase WBC )
Hatching test (examination of eggs for viability )
Serological diagnosis
X-ray
UltraSound
Intradermal Skin test
11 - Treatment : Metrifonate – Niridazole – Praziquantel