الفهرس 
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Abstract
This study was conducted during the period from May 2010 to August 2012. The total study population included 1768 cases of different ages in both sexes from the attendants of the outpatients clinics of the Mansoura University Hospital, Department of Pediatrics. Primary & prep school and rural health units in Dakahlia Governorate. Four centers were included; Mansoura, Talkha, Belqas and Aga. Examined persons were 912 males and 856 females
All Population were subjected to personal history taking, clinical manifestations (mainly gastro-intestinal) recording, clinical examination and laboratory examination including urine and stool examination, stool culture for Strogyloides, coproantigens detection (for diagnosis of Cryptosporidium and Giardia), serodiagnosis (Hydatidosis, Fascioliasis, Schistosomiasis, Strongyloidiasis, Toxoplasmosis, Malaria and Giardiasis), in addition to abdominal sonograms of fascioliasis cases.
On stool examination the most frequent parasites detected were :Fasciola11(0.62%) Schistosoma mansonai 9(0.51%) Strongyloides Stercoralis larva 13(0.74%) Hymenolipes nana 17 (0.96%) Enterobius vermicularis 9(0.51%). Blastocystis hominis 169 (9.56%) Giardia lamblia 211(11.93%) Entamoeba histolytica 125(7.07%) Cryptosporidium pravum 109(6.17%) Iodamoeba betshuli 33(1.87%). Using serodiagnostic technique, hydatid two cases, Toxoplsma 182 cases and malaria one case.
The most common parasitic infection was Giardia lamblia and was more prevalent in Talkha and (ELISA) was the most sensitive test.
Fasciola spp, Schistosoma mansoni and Strongyloides stercoralis were more prevalent in Talkha and ELISA test was the most sensitive for diagnosis, Similar to Cryptosporidium.