Hey DR. I have 2 questions The first one 8 months ago i made a helicobacter pylori antibody test and it came out positive My Questions ,is that test is specific fop h.pylori infection, The second questions , i made stool culture and sensitivity test also but it was negtavie for shigella and stap. aureus , but with direct examintatiom with (metheylen blue ) it showed occasional leukocytes and occasional yest , what does that mean ,