The present study evaluated the anti- Helicobacter pylori IgG, IgA and the role of virulence factor of H. pylori Vacuolating associated cytotoxin gene (Vac A) as a risk factors for CAD. The levels of serum IgG and IgA was done by indirect immunofluorescent (IIF) whereas Vac A measured by enzyme linked immunosorbent assay (ELISA). Ibn Al-Bitar specialist center for cardiac surgery laboratory and Ministry of Health/ Baghdad/ Iraq, between May and October 2018. Seventy Iraqi patients with CAD were enrolled in this study, their ages ranged between 40-84 years ; and 20 individuals as a control group which was divided into 2 subgroups: 10 apparently healthy volunteers (negative control) and the other subgroup contained 10 with normal coronary artery but had other heart disease except CAD (positive control). There were high significant differences (P< 0.01) of anti- H. pylori IgG between CAD patients and both positive and negative controls. 78.57% (55/70), 100% (10/10) and 0% (0/10) respectively. Also, a highly significant difference was observed in the serum level of anti H. pylori IgA between CAD patients and both positive and negative controls37.14 % (26/70), 30% (3/10) and 0% (0/10) respectively. There is significant difference in the mean value of Vac A antigen of CAD patients when compared to control group (1.299± 0.04), and (1.41±0.13) respectively. As well as a significant difference found between another CAD patient group as compared to control group (1.79±0.17), (1.41±0.13) respectively (P˂ 0.05). The results suggest a relationship between Helicobacter pylori infection and coronary artery disease.