中国P站

Microbial contamination; Urban rivers; Antibiotic resistance; Fecal coliforms; Public health risks; Water quality; Wastewater management; Ecosystem health; Pathogenic bacteria; Source tracking

Introduction

This study assessed the bacteriological quality of the Bagmati River in Kathmandu, Nepal, revealing high levels of fecal coliforms and E. coli. It highlighted significant health risks for communities using the river for various purposes, emphasizing the urgent need for improved wastewater management and public health interventions to mitigate microbial contamination[1].

This research investigated the microbiological quality of rivers used for recreation in a South African peri-urban region, finding high levels of fecal indicator bacteria. The findings highlight significant health risks associated with recreational water use, pointing to the need for continuous monitoring and public awareness campaigns to prevent waterborne diseases[2].

This study explored the distribution of antibiotic-resistant bacteria and their associated genes in a river impacted by both urban and agricultural pollution. It revealed a significant increase in multi-drug resistant strains and various resistance genes, underscoring the critical role of river systems as hotspots for antibiotic resistance dissemination and potential public health threats[3].

This study assessed the ecological and human health risks posed by fecal indicator bacteria in the Yellow River basin, China. It revealed widespread contamination exceeding safety limits, particularly in areas influenced by agriculture and urbanization. The findings emphasize the need for integrated water management strategies to protect both ecosystem health and human populations from microbial pollution[4].

This research mapped the spatiotemporal distribution of microbial contamination in the Ganga River, India, identifying significant variations influenced by seasonal changes and anthropogenic activities. The study highlighted critical areas of concern for public health due to pathogenic bacteria, emphasizing the need for targeted interventions to improve river water quality[5].

This study investigated seasonal shifts in bacterial community structure and composition in a subtropical urban river influenced by treated wastewater discharge. It revealed distinct community profiles across seasons, highlighting the impact of effluent on microbial diversity and the persistence of specific bacterial groups, which is crucial for understanding river ecosystem health[6].

This study evaluated the presence of coliform bacteria and their health risks in the urban stretch of the Tapi River, India. It revealed alarmingly high levels of fecal coliforms, indicating severe contamination from domestic wastewater and posing substantial public health risks to local communities reliant on the river, emphasizing the need for robust sanitation infrastructure[7].

This study employed metagenomic analysis to characterize antibiotic resistance genes and bacterial communities in a river downstream from hospital wastewater discharge. It revealed a significant increase in diverse resistance genes and specific pathogenic bacteria, emphasizing the profound impact of hospital effluent on river microbial ecology and the potential for widespread dissemination of antibiotic resistance[8].

This study employed both next-generation sequencing and traditional microbial indicators for source tracking of fecal contamination in urban rivers. It successfully identified diverse sources, including human, livestock, and avian inputs, demonstrating the effectiveness of integrated approaches for pinpointing pollution origins and guiding targeted remediation efforts to improve river water quality[9].

This investigation focused on the prevalence of pathogenic bacteria and their antibiotic resistance profiles in a major urban river in Northeast China. It detected a range of multi-drug resistant pathogens, posing substantial public health concerns. The study underscores the river's role in disseminating antibiotic resistance and highlights the urgent need for stringent water quality management and sanitation improvements[10].

Description

Studies widely demonstrate severe microbial contamination in urban rivers, posing substantial public health risks to communities worldwide. For instance, the Bagmati River in Kathmandu, Nepal, exhibits high levels of fecal coliforms and E. coli, underscoring significant health risks for populations relying on the river [1]. Similarly, South African recreational rivers show elevated fecal indicator bacteria, highlighting health concerns for recreational water users and the need for continuous monitoring [2]. In India, both the Ganga River and Tapi River urban stretches reveal critical levels of microbial contamination, including pathogenic bacteria and fecal coliforms, leading to significant public health risks due to anthropogenic activities and domestic wastewater discharge [5, 7]. The Yellow River basin in China also faces widespread contamination exceeding safety limits, particularly in agricultural and urbanized areas, emphasizing threats to both ecosystem health and human populations [4]. These findings collectively highlight the urgent need for improved wastewater management and public health interventions to mitigate microbial pollution across diverse geographical contexts [1, 2, 4, 5, 7].

Beyond general microbial pollution, urban rivers are increasingly recognized as hotspots for antibiotic resistance dissemination, posing critical public health threats. Research on a river impacted by urban and agricultural pollution in one study revealed a significant increase in multi-drug resistant bacterial strains and various resistance genes [3]. This concern is further amplified by studies employing metagenomic analysis, which characterize antibiotic resistance genes and bacterial communities downstream from hospital wastewater discharge. These investigations show a profound impact of hospital effluent on river microbial ecology, leading to a significant increase in diverse resistance genes and specific pathogenic bacteria [8]. Moreover, a major urban river in Northeast China was found to harbor a range of multi-drug resistant pathogens, directly underscoring the river's role in disseminating antibiotic resistance [10]. These studies collectively call for stringent water quality management and sanitation improvements to counter the spread of antibiotic resistance in aquatic environments [3, 8, 10].

To effectively address river contamination, understanding the characteristics and sources of pollution is crucial. Investigations into seasonal shifts in bacterial community structure and composition in subtropical urban rivers, particularly those receiving treated wastewater discharge, reveal distinct community profiles across seasons. This highlights the ongoing impact of effluent on microbial diversity and the persistence of specific bacterial groups, which is vital for understanding river ecosystem health [6]. Furthermore, advanced methodologies are being deployed for precise source tracking. One study utilized both next-generation sequencing and traditional microbial indicators to identify diverse sources of fecal contamination in urban rivers, including human, livestock, and avian inputs. Such integrated approaches prove effective in pinpointing pollution origins and guiding targeted remediation efforts to enhance river water quality [9].

The implications of widespread microbial and antibiotic resistance contamination in urban rivers are profound, necessitating robust and integrated management strategies. The consistent findings of health risks associated with recreational water use [2] and reliance on contaminated rivers for various purposes [1, 7] underscore the direct threats to human well-being. The persistence of specific bacterial groups and antibiotic resistance genes further complicates remediation [6, 8]. Therefore, researchers consistently emphasize the need for integrated water management strategies to protect both ecosystem health and human populations [4]. This includes robust sanitation infrastructure [7], continuous monitoring, public awareness campaigns [2], and targeted interventions [5]. Ultimately, the goal is to improve river water quality by addressing the root causes of contamination, from domestic and hospital wastewater to agricultural runoff, ensuring healthier aquatic environments and safeguarding public health [1, 3, 4, 5, 7, 8, 9, 10].

Conclusion

These studies collectively highlight pervasive microbial contamination in urban rivers worldwide, posing significant public health and ecological risks. Research across locations like Nepal's Bagmati River, South Africa's recreational rivers, China's Yellow River basin, and India's Ganga and Tapi Rivers consistently reveal high levels of fecal coliforms, E. coli, and other fecal indicator bacteria. This widespread pollution often stems from domestic wastewater, urban runoff, and agricultural activities, impacting communities reliant on these rivers for various purposes. A critical aspect of this contamination is the alarming prevalence of antibiotic-resistant bacteria and their associated genes. Studies demonstrate rivers as hotspots for antibiotic resistance dissemination, with significant increases in multi-drug resistant strains observed in rivers affected by urban and agricultural pollution, as well as those downstream from hospital wastewater discharge. Pathogenic bacteria and their resistance profiles are also a concern in major urban rivers in Northeast China. Researchers use advanced techniques like metagenomic analysis and next-generation sequencing alongside traditional indicators to characterize bacterial communities, track contamination sources, and understand seasonal variations in microbial structure. The findings consistently emphasize an urgent need for improved wastewater management, robust sanitation infrastructure, continuous monitoring, and targeted public health interventions to mitigate microbial pollution and the associated health risks. Integrated water management strategies are essential to protect both human populations and river ecosystems from these escalating threats.

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