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. 1995 Oct;33(10):2752–2756. doi: 10.1128/jcm.33.10.2752-2756.1995

Diagnosis of Helicobacter pylori infection by PCR: comparison with other invasive techniques and detection of cagA gene in gastric biopsy specimens.

A P Lage 1, E Godfroid 1, A Fauconnier 1, A Burette 1, J P Butzler 1, A Bollen 1, Y Glupczynski 1
PMCID: PMC228568  PMID: 8567918

Abstract

A PCR assay for the detection of Helicobacter pylori in gastric biopsy specimens with specific primers for ureC gene amplification (herein referred to as ureC PCR) was compared with other routine invasive methods (culture, the rapid-urease test, and Giemsa staining of histological sections) with samples from a group of 104 consecutive dyspeptic patients. Bacteria were found in 40 (38.5%), 38 (36.5%), 36 (34.6%), and 35 (33.7%) of the patients by ureC PCR, culture, the rapid-urease test, and Giemsa stain, respectively. Sixty-three patients had negative cultures, negative histological examinations, and negative rapid-urease test results, and 61 of these patients were also negative by ureC PCR. ureC PCR detected H. pylori in two culture-negative patients. In parallel, a PCR-based assay to detect the H. pylori cytotoxin-associated antigen (cagA) gene, a putative virulence gene, was also developed. To assess the likelihood of detection of H. pylori genes directly from gastric biopsy samples and from the corresponding H. pylori isolates, specimens from 31 patients were subjected to PCR with ureC- and cagA-targeting primers. All 31 biopsy specimens and the corresponding H. pylori isolates were positive in the ureC PCR. H. pylori strains that were cagA positive also gave positive cagA PCR fragments with biopsy specimens from the same patients. All ureC PCR-positive patients were examined; biopsy specimens from 10 of 11 (91.7%) duodenal ulcer patients harbored H. pylori cagA-positive strains, whereas 19 of26 (73%) of those from patients with chronic gastritis only were found to be cagA positive.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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