Helicobacter pylori is a gram-negative, micro-aerobic, spiral-shaped bacteria which is considered one of the main factors that lead to stomach disorders such as gastric atrophy, stomach cancer, chronic gastritis, and peptic ulcers. The present study was carried out in Nineveh Governorate, Iraq. The sample of the study included 325 participants. After conducting a series of tests to detect whether H. pylori infection is positive among the participants, it has been shown that the number of infected participants were150 (48 males and 102 females), then complete Blood Counts test have been done in order to investigate the relationship between the Component Blood Count and the infection of H. pylori.Based on the results, it is concluded that H. pylori infection is more prevalent in females. Also, the percentage of infection decreases in ages over 60 years and in children less than 15 years. Moreover, it is revealed that the incidence of H. pylori infection increases in people with blood type A. Finally, the study doesn't show any effect of smoking on the increased risk of infection with H. pylori. In this study, the infected patients with H. pylori recorded an increase in WBCs equal to 24%, while lymphocyte counts didn't record any changes, RBCs were increased by 12%, some infected patients had fluctuations of increase and decrease in the level of Hb, the figures were between 8% and 24%, respectively, the increase in the platelet count was 12%, and the decrease was 4%. Hence, there are significant differences in the relationship between infection with H. pylori and other factors such as; gender, age, WBCs, lymphocyte counts, RBCs, Hb, and platelet counts in the infected group at P ≤ 0.05.
