Mohammad Abu-Lubad1*, Hamed Alzoubi1, Dua’a Jarajreh1,
Alaa Al Sawalqa2 and Munir Al-Zeer3

1Department of Medical Microbiology and Immunology, Mutah University Faculty of Medicine, Jordan.
2Royal medical services, Department of Dentistry, King Hussein Medical Center.
3Department of Molecular Biology, Max Planck Institute of Infection Biology, Berlin, Germany.


The human pathogen Helicobacter pylori infects around 50% of the global
population. Significant proportion of infected individuals with H. pylori can undergo
gastritis or gastric adenocarcinoma. The major source and reservoir of infection and
transmission with H. pylori is not fully understood, yet. Oral cavity has been proposed to
be a reservoir for H. pylori and possibly a major source of gastric reinfection; however, the
results are still controversial. In this study a total of sixty Jordanian individuals were
tested for the presence of H. pylori in their dental plaques. Samples were analyzed by PCR
to detect for the presence of H. pylori using specific primers for H. pylori 16s ribosomal
RNA gene. Our data show that all individuals tested in this study were found positive for
H. pylori. Although, individuals tested in this study were heterogeneous in term of age,
sex, education, and geographical region but this did not influence the presence ofH.
pylori in the dental plaque of Jordanians. The results of the present study suggest that the
oral reinfection route of transmission of H. pylori should be taken into consideration
because it may explain the high prevalence of H. pylori associated gastritis in Jordanian

Keywords: DNA: deoxyribonucleic acid, MALT: Mucosa associated lymphoid
tissue lymphoma, PCR: polymerase chain reaction, bp: base pair.