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Detection of Helicobacter pylori vacA, cagA and iceA1 virulence genes associated with gastric diseases in Egyptian patients
4th International Congress on Infectious Diseases
Dalia Salem, Ahmed El-Shenawy, Manal Diab, Mohamed Shemis, Maged El-Ghannam, Moustafa Abdelnasser, Mohamed Shahin, Mahmoud Abdel- Hady, Effat El-Sherbini and Mohamed Saber
Theodor Bilharz Research Institute, Egypt Al-Azhar University, Egypt
Posters & Accepted Abstracts: J Infect Dis Ther
Abstract
Helicobactor pylori (H. pylori) virulence markers would be useful to predict peptic ulcer disease (PUD) or gastric cancer. In Egypt, since inadequate data are present regarding H. pylori virulence�related genes in different age group patients with gastroduodenal diseases, it becomes crucial to study the clinical status of cagA, vacA and iceA1 genotypes of H. pylori strains recovered from patients with dyspepsia. The study included 113 dyspeptic patients who were exposed to upper gastrointestinal endoscopic examination. Four antral biopsies were obtained from each patient for the analysis of H. pylori infection by rapid urease test and detection of 16S rRNA. 60 (53.1%) patient were confirmed to be infected with H. pylori. Upon endoscopy gastritis was revealed in 27 (45%) and 10 (16.7%) had PUD. Of the 60 H. pylori strains, 39 (65%) had at least one virulence gene. Six different genotypic forms were recognized; vacA (9/60), iceA1 (1/60), vacA/cagA (7/60), vacA/iceA1 (13/60), vacA/cagA/ (8/60), only one cagA/iceA type and we could not detect cagA. The overall vacA, iceA1 and cagA genes were identified (61.6%, 38.8%, 26.6% respectively) by PCR-based molecular testing. The vacA gene status was highly significant related to gastritis patient (P�0.036). The vacA s1m1 and s2m2 alleles were significantly found in 50% of H. pylori infected patients with PUD and with gastritis 57.1% respectively (P�0.01). In conclusion, the main genotype combinations in the studied Egyptian patients were; vacAs2m2/iceA1, vacAs1m1/cagA, mostly associated with gastritis, and vacAs1/cagA/icA, mainly in PUD. The less virulent (s2, s2m2) H. pylori genotypes were found in patients aged over 43 years.Biography
Dalia Salem is a Lecturer of Medical Microbiology at Theodor Bilharz Research Institute- Egypt. Her special research interest and expertise is in “Detection of emerging mechanisms of multi-drug-resistant bacteria and their susceptibility patterns to novel antibiotics in addition to antimicrobial resistant genes and virulence markers in Helicobacter pylori-related infections”.
Email: drdaliasalem@gmail.com
