Shadia M el-Dafrawy

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This investigation was carried out to study the susceptibility of Saudi Biomphalaria arabica to Egyptian Schistosoma mansoni in comparison with the susceptibility of Egyptian Biomphalaria alexandrina to the same parasite. This was in order to know the possibility that the parasite might be able to spread into Saudi Arabia and to determine the genetic(More)
The reaction of the haemolymph and the tissue of infected intermediate hosts, Biomphalaria alexandrina and Bulinus truncatus to Schistosoma mansoni and S. haematobium antigens were investigated using the indirect immunoperoxidase technique. A new technique, Agarose cell block was used in collection of haemolymph which helped in collecting plenty of well(More)
Electrophoresis of plasma protein of B. alexandrina (uninfected & infected with S. mansoni) showed that the major dominant bands had molecular weights of 20, 44, 96, 139 & 205 KD in both types of snails. The 1day & 1 week post miracidial exposure (PME) groups were characterized by band 54 KD. All groups except a day PME were characterized by a common band(More)
Lymnaea natalensis were collected from several localities in Giza Governorate (El-Mansouria, Kafr Hakim and The Nile). The collected snails were examined for cercarial shedding and measurement of shell was carried out using a virner caliper. A total of 217 Lymnaea was collected from all habitats and 24 snails were found to shed Fasciola gigantica cercariae(More)
The survival rate and fecundity of B. alexandrina were greatly influenced when exposed to either S. mansoni or E. liei miracidia. The snails exhibited much lower survival rate and fecundity when double exposed to both S. mansoni and E. liei miracidia than single exposure and control snails. The results indicated a disruption in the snail metabolism due to(More)
Some snails of Biomphalaria alexandrina can resist the infection of Schistosoma mansoni so this study aimed to clearly this mechanism by using light and electron microscopy (EM) and determine the role of Nitric oxide in this mechanism. B. alexandrina snails used in this study were exposed individually to S. mansoni infection according to their response they(More)
The survival rate and fecundity of B. alexandrina were greatly reduced when exposed to E. liei miracidia. Also, exposure of B. alexandrina snails to E. liei miracidia induced a disruption in the snail metabolism and this effect was more pronounced in 20-days post-miracidial exposure group than in 10-days group. Protein content was significantly reduced in(More)
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