Detection of Helicobacter pylori genes (CagA and VacA) in municipal drinking water
Publish Year: 1401
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_EHEM-9-3_011
تاریخ نمایه سازی: 9 مهر 1401
Abstract:
Background: Helicobacter pylori is classified as a carcinogen, and it is also the most common cause of chronic bacterial infection and peptic ulcers. Approximately ۴۵% of people are infected with the bacterium.
Methods: In this study, the H. pylori genes, CagA and VacA, were investigated in drinking water, using ۱۰۰ samples (۵۰ samples from the municipal water supply and ۵۰ samples from the effluent of household water treatment devices). DNA was extracted from colonies with a positive heterotrophic plate count (HPC) for use in molecular testing and microbial identification. The polymerase chain reaction (PCR) was used to identify H. pylori.
Results: The study showed that ۲۴% of urban water samples (۱۲% above the World Health Organization [WHO] standards for safe drinking water) and ۱۸% of home water treatment-device samples (۴% above the WHO standards) were HPC-positive. The H. pylori genes, CagA and VacA, were identified in ۲% of the samples from household water treatment devices and ۸% of the municipal water supply samples.
Conclusion: The study findings show that H. pylori may be transmitted in drinking water. However, there is currently no strong evidence that the bacteria can survive after the disinfection process in the water supply system. Therefore, the health risks of this bacterium in drinking water are still unknown.
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Authors
Fathollah Gholami-Borujeni
Corresponding author: Department of Environmental Health Engineering, Faculty of Health, Mazandaran University of Medical Sciences, Sari, Iran
Hamzeh Rahimi
Department of Molecular Medicine, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
Seyed Mehdi Sajjadi
Cellular and Molecular Research Center, Birjand University of Medical Sciences, Birjand, Iran
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