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Abstract Background & Objectives: Giardia lamblia is one of the most common protozoa in human being throughout the world. The different isolates of this parasite have various potential pathogenicity. Clinical demonstrations of Giardiasis are acute diarrhea, chronic diarrhea syndrome and malabsorbtion.The aim of this study has been the observation of the different kinds of clinical features in patients with Giardia lamblia referred to the Hamadan faculty of medicine, 2004- 2005 Materials & Methods: The fecal samples of 274 patients referred to Hamadan faculty of medicine were examined via direct and Formol- Eter methods. By a questionnaire, the subjects’ clinical manifestations were recorded and then analyzed. Results: In this study, 20.4% of the patients (55.4% male, 44.6% female) were infected with Giardia. 46.5% of them complained of abdominal pain. The prevalence of Giardia was 30.8 %( 6-10 years) and 23.1% (1-5 years). The most common signs observed were abdominal pain, diarrhea and vomiting, respectively. Conclusion: The most common sign observed in this study was abdominal pain, partially similar to studies carried out in other parts of Iran and the world too. Key word: Giardiasis, Clinical Signs,Epidemioloy,Hamadan

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Abstract Background and objectives: Acquired immunodeficiency syndrome (AIDS) is acquired by infection with human immunodeficiency virus. (HIV).Parasite caused infection is the most common problem in AIDS Patients. Sometimes unusual and opportunistic infections such as intestinal parasitic infections may cause serious gastric intestinal (GI) disorders, which can finally lead to death. The aim of this study is to find intestinal parasites in AIDS patients referred to Disease Consultation Center of Kermanshah province. Materials and methods: In this study, the stool samples were collected from 75 AIDS patients admitted to Kermanshah consultation disease center. Then, all samples were tested by direct and formalin ether methods. Results: As shown in results , 13 patients (17.4%) are infected with Entamoeba coli, two( 2.7%) with Entamoeba histiolyticaly,one(1.4%) with Giardia lumbelia ,six (8%) with Blastocystis hominis ,two( 2.7%) with Isospora belli ,one(1.4%) with Ascaris lumbericoides ,two( 2.7%) with Endolimax nana . Conclusion: This study indicated that the frequency of pathogenic and non-pathogenic parasites was low in HIV+ patients. This may be related to anti-parasitic drugs used in all HIV+ patients admitted to Kermanshsh nsultation Disease center. Key words : Intestinal parasitic Infections, AIDS, Kermanshah consultation Disease center

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Abstract Background&Objectives: High prevalence of parasitic infections can be the result of the subclinical infections. Some regular and ongoing epidemiological studies are needed to combat and control these infections. This study was conducted on elementary school students to achieve an overview of the spread of parasitic infections in Gorgan. Material & Methods: In this cross-sectional study, using random cluster sampling, 800 of 7-12 year-old students were selected from 18 primary schools in Gorgan. The stool samples taken on three consecutive days were examined by two methods including direct smear and formalin-ether concentration. Results: Overall, 230 (28.8%) are infected by intestinal parasites. The protozoa are Blastocystis hominis (122 15/2%), Entamoeba coli (93 11/6%), Giardia intestinalis (79 9.9%), and Entamoeba histolytic (8 1%). The Helminthes are Hymenolepis nana (12 1.5%), Entrobius vermicularis (10 1.2%), Ascaris lumbricoides in 4 (0.5%) and hook worms (3 0.4). Conclusion: Based on the results, the prevalence of intestinal parasites is quite high among primary school students especially in families with low education level, income and sanitary level. Hence, it is a necessity to promote the hygienic knowledge of the students . Key words: Prevalence, Intestinal parasites, Primary schools students, Gorgan