الفهرس 
Material and methodsOnly 14 pages are availabe for public view
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Abstract
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Schistosomiasis is one of the world’s
formost health problem. In Egypt, approximately
20 million individiua1s are sUffering from
schistosomiasis ( Abd - E1-Wahab et a1., 1979) •
The early lesions of intestinal bilharziasis
are usually affecting the last few inches of the
rectal wall withen reach of the sigmoidoscope
(Arafa.,1962).
Sigmoidoscopy and rectal snip is, therefore
helpful especially in detecting active infection in
the early localization stage, during asymptomatic
intestinal bilharziasis and in chronic cases when
the eggs are encapsulated in the tissue (EI-Shafei.,
1962) •
It is desirable to take several biopsy samples
from the rectum because abnormalities can be patchy
or not easily seen on endoscopy ( preston et a1.,
1983) •
The desi~~ of this stu~ was maL~ly intended
to demonstrate the diagnostic value of sigmoidscopy
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and the rectal snip tecr~ique in patients with
presumed schistosomiasis •
The subject of the present study comprises
150 cases which are divided into three groups.
Group (A) with urine positive and stool negative
for schistosome ova. Group (B) with stool positive
and ur~ne negative for schistosome ova. Group (C)
whth presumed schistosomiasis with urine and stool
negative for ova.
Almost 18 patients of group A and B were symptom
free • This stress the importance of screening
urine and stool analysis in individuals living in
endemic areas.
Clinical eXaminations, laboratory investigations
and rectal mucosal biopsies at 10 and 20 em. levels
were performed to all the cases.
The present findings showed astatistical significant
difference at 0.1% level between the results
of urine and stool analysis when compared with that
of the rectal mucosal biopsy. The rectal mucosal
biopsy has the upper hand.
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Mixed schistosomal infection were more
prevalent than pure one, but it was not detected
by urine and/or stool examination. The velue
of such findings is mainly of help in having the
right ’choice of the drugs that may be used in
the treatment.
The results also confirm that nlucosal biopsy
at 10 cm level is most diagnostic significantly than
at 20 cm level.
The sensitivity of rectal snip at 10 em level
was very p~gh( 98%) with false negativity of 2%
when urine end stool were positive for schistosome
ova.
The predected value of rectal snip with negative
urine and/or stool for schistosome ova was computed
statistically with a result of ( 73.7%). This means
that after urine , stool and rectal snip negativity
for schistosome ova. there is only (26.3%) positivity
that patient still harbour the infection.
Finally this encouragement results of diagncEing
presumed schistosomiasis should be used with spread
using of the rectal snip method for diagnosis of closed
infection. This particularly important in endemic areas.