Characterization of pathogen distribution and pathogenicity from landfill site

Area of Science:

• Environmental microbiology
• Public health
• Genomic epidemiology

Background:

• Landfills are recognized as significant reservoirs for diverse microbial communities, including potential human pathogens.
• The environmental dissemination and ecological dynamics of these pathogens and their associated genetic elements remain incompletely understood.

Purpose of the Study:

• To investigate the abundance, distribution, and influencing factors of pathogens within landfills and surrounding environments.
• To characterize the prevalence and co-occurrence patterns of human bacterial pathogens (HBPs), antibiotic resistance genes (ARGs), and virulence factors (VFs).

Main Methods:

• Environmental sampling across various matrices (atmosphere, soil, vegetation, groundwater) and landfill depths.
• Quantitative analysis of microbial contamination and genetic elements (ARGs, VFs).
• Community analysis to understand co-occurrence patterns and ecological interactions.

Main Results:

• Pathogen contamination detected in external environments (atmosphere, soil, vegetation, groundwater) with higher levels inside landfills.
• Increased abundance of HBPs, ARGs (especially multidrug-resistant), and VFs with landfill depth.
• Nonrandom co-occurrence of ARGs, VFs, and HBPs, enhancing pathogen resistance and pathogenicity.
• Prevalence of high-risk pathogens like Pseudomonas aeruginosa, Salmonella enterica, Staphylococcus aureus, and Mycobacterium tuberculosis.

Conclusions:

• Landfill depth significantly influences the abundance and genetic profiles of pathogens, ARGs, and VFs.
• Interactions between HBPs, ARGs, and VFs within landfills create a high-risk environment.
• Understanding microbial distribution and pathogenicity is crucial for effective landfill pathogen management and public health protection.