Does CagA contribute to ulcer pathogenesis in a developing country, such as Sudan?

Area of Science:

• Gastroenterology
• Infectious Diseases
• Microbiology

Background:

• Peptic ulcer disease (PUD) is linked to Helicobacter pylori (H. pylori) CagA strains in Western populations.
• Africa has high rates of H. pylori infection and PUD, but virulence factor data is limited.
• This study investigates CagA antibody prevalence in African patients and healthy volunteers.

Purpose of the Study:

• To determine the prevalence of CagA antibodies in African patients with dyspepsia undergoing gastroscopy.
• To assess CagA seropositivity in asymptomatic H. pylori-positive African volunteers.
• To explore the association between CagA seropositivity and gastroduodenal disease in an African context.

Main Methods:

• Studied 82 consecutive patients undergoing gastroscopy; 78 were H. pylori positive.
• Collected antral biopsies and blood samples for CagA seropositivity determination via western blot.
• Assessed CagA seropositivity in 65 H. pylori-positive healthy volunteers.

Main Results:

• CagA seropositivity was high in patients with active peptic ulcer disease (100%), duodenitis (89%), gastritis (78.9%), and normal endoscopy (85.7%).
• Histological assessment showed CagA seropositivity rates of 84.7% (chronic active gastritis) to 100% (intestinal metaplasia).
• Among healthy volunteers, 87.7% of H. pylori-positive subjects were CagA seropositive.

Conclusions:

• CagA seropositivity correlates with gastroduodenal disease and advanced histology in this African population, similar to Western findings.
• A high prevalence of CagA seropositivity exists in asymptomatic African individuals.
• Factors beyond CagA likely play a predominant role in ulcer pathogenesis in this population.