Microbial Diversity of Source and Point-of-Use Water in Rural Haiti - A Pyrosequencing-Based Metagenomic Survey.

Area of Science:

• Environmental microbiology
• Public health microbiology
• Water quality assessment

Background:

• Haiti faces severe water and sanitation challenges, leading to high rates of waterborne diseases.
• Waterborne pathogens are a primary cause of illness and death in the region.
• Existing infrastructure is insufficient to ensure safe drinking water access.

Purpose of the Study:

• To analyze the bacterial diversity in rural Haitian water sources and point-of-use samples.
• To identify potential bacterial pathogens and biofilm-forming bacteria in drinking water.
• To assess the microbial risks associated with water consumption in Central Plateau, Haiti.

Main Methods:

• Pyrosequencing of 16S rRNA genes was used to determine bacterial composition.
• Water samples were collected from both source and point-of-use locations in rural Haiti.
• Taxonomic analysis identified bacterial phyla, families, and genera present in the water.

Main Results:

• Firmicutes, Proteobacteria, and Bacteroidetes were the dominant bacterial phyla.
• Pathogenic genera including Klebsiella, Aeromonas, Bacillus, Clostridium, and Yersinia were detected.
• Biofilm-associated genera like Chryseobacterium and Pseudomonas were prevalent in point-of-use water.

Conclusions:

• The presence of diverse bacterial pathogens in drinking water poses a significant health risk in rural Haiti.
• Point-of-use water, including stored water and filtered water, showed higher pathogen loads.
• Improved water handling, purification, and treatment are crucial to prevent bacterial transmission and ensure safe water access.