iarjpidIARJPIDIARJPID2789-608010.47310/iarjpid.2025.v04i01.001The Relation Between H.Pyloi And Vitamin D3RaadMohammadMahmoodAmeraMahmoodAlrawiDepartment of biology, collage of science, university of Mosul, Nineveh Government, IraqHelicobacter pylori (H.pylori)  is a gram-negative spiral-shaped bacterium belonging to Helicobacteraceae. It is a transmissible and pathogenic thought contaminant of digested food. H.pylori positivity rates appear to be higher among people with Vitamin D3 deficiency in the blood.Aim of study, This research aims to study the relationship of H.pylori  with levels of Vitamin D3.Methods: (120) samples were collected and divided into (60) faecal samples with (60) blood samples from different patients, Faecal samples were used for detecting H.pylori Ag, and blood samples were used to detect H.pylori Ab, in addition to measurement the levels of Vitamin D3. Results: 53.33% of stool sample were positive for H.pylori Ag test while 46.66% was negative for this,In addition, 84.37 % from patients were positive for H.pylori Ag  have Vitamin D3 level less than (29)ng/ml and 64.28% from them have Vitamin D3 level more than (30) ng/ml.