helicobacter pylori. a bacteria causing stomach infections, linked to ulcers and gastritis.

helicobacter pylori bacteria stomach infection peptic ulcer gastritis duodenal ulcers gastrointestinal microbiota urease antibiotics antimicrobial therapy acid proton pump inhibitors mucosa inflammation dyspepsia diagnosis biopsy endoscopy eradication treatment clarithromycin metronidazole amoxicillin resistance antibiotic susceptibility virulence caga vaca colonization gastric carcinogenesis immune response gastroenterology pathogenesis pathophysiology transmission prevalence risk factors