Immunocytochemical identification of Campylobacter pylori in gastritis and correlation with culture.

Endoscopic biopsy specimens of antral mucosa from 25 patients presenting with gastric complaints were obtained for culture and histologic and immunocytochemical studies. The histopathologic study revealed chronic gastritis in 22 patients and borderline chronic gastritis in three patients. The unlabeled-antibody peroxidase-antiperoxidase (PAP) method was applied for the detection of Campylobacter pylori, and its results were compared with those obtained with the culture technique. Strongly positive immunoperoxidase staining was localized in spiral, curved bacteria that were present in the mucus layer adjacent to the gastric epithelial cell surface. The microorganisms were frequently congregated in clumps and were sectioned in several directions. The PAP stains were positive in 19 specimens (76%), and the cultures were positive in 20 (80%). All results negative by culture were also negative by PAP method. Compared with the cultures, the sensitivity and positive predictive value of the PAP method for identification of C pylori in antral mucosa obtained from endoscopic biopsy specimens were 95% and 100%, respectively.