ABSTRACT
This study was carried out on a sample of 1240 adult persons. In giardiasis symptomatic group [I], the prevalence of diarrhea was 71.43%, 100% in grade 0, I, II, III and IV pathology, respectively, which was statistically insignificant in comparison with each other. The prevalence of abdominal pain was 71.43%, 73.33%, 95%, 91.67% and 100% in grade 0, I, II, III and IV pathology, respectively, which was statistically insignificant compared with each other. The prevalence of flatulence was 42.86%, 40%, 80%, 83. 33% and 100% in grade 0, I, II, III and IV pathology, respectively, which was statistically significant in comparison with each other. So, the prevalence of flatulence was more frequent in patients with marked pathological changes in the duodenum. The prevalence of anorexia was 14.29%, 53.33%, 65%, 50% and 100% in grade 0, I, II, III and IV pathology, respectively, which was statistically significant in comparison with each other. The prevalence of vomiting was 0%, 13.33%, 15%, 16.67% and 85.71% in grade 0, I, II, III and IV pathology, respectively, which was significantly increased in grade IV and disappeared in grade 0