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From wastewater discharge to the beach: Survival of human pathogens bound to microplastics during transfer through the freshwater-marine continuum
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Researchers investigated how human pathogens survive on microplastic surfaces as they travel from wastewater treatment plants through freshwater into marine environments. They found that the biofilm environment on plastic surfaces helped bacteria like E. coli and Enterococcus faecalis persist longer during transitions between water types compared to bacteria in the surrounding water. The study suggests that microplastics may facilitate the environmental spread of pathogens by providing a protective habitat during transport.
Large quantities of microplastics are regularly discharged from wastewater treatment plants (WWTPs) into the aquatic environment. Once released, these plastics can rapidly become colonised by microbial biofilm, forming distinct plastisphere communities which may include potential pathogens. We hypothesised that the protective environment afforded by the plastisphere would facilitate the survival of potential pathogens during transitions between downstream environmental matrices and thus increase persistence and the potential for environmental dissemination of pathogens. The survival of Escherichia coli, Enterococcus faecalis and Pseudomonas aeruginosa colonising polyethylene or glass particles has been quantified in mesocosm incubation experiments designed to simulate, (1) the direct release of microplastics from WWTPs into freshwater and seawater environments; and (2) the movement of microplastics downstream following discharge from the WWTP through the river-estuary-marine-beach continuum. Culturable E. coli, E. faecalis and P. aeruginosa were successfully able to survive and persist on particles whether they remained in one environmental matrix or transitioned between different environmental matrices. All three bacteria were still detectable on both microplastic and glass particles after 25 days, with higher concentrations on microplastic compared to glass particles; however, there were no differences in bacterial die-off rates between the two materials. This potential for environmental survival of pathogens in the plastisphere could facilitate their transition into places where human exposure is greater (e.g., bathing waters and beach environments). Therefore, risks associated with pathogen-microplastic co-pollutants in the environment, emphasises the urgency for updated regulations on wastewater discharge and the management of microplastic generation and release.
More Papers Like This
Survival of human pathogens bound to microplastics during transfer through the freshwater-marine continuum: from wastewater discharge to the beach
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Researchers tracked survival of E. coli, E. faecalis, and P. aeruginosa colonizing polyethylene microplastics as particles were transferred through a series of mesocosms simulating downstream transport from wastewater effluent through freshwater, estuary, seawater, and beach sand. All three pathogens survived the full environmental transition sequence in the plastisphere, with higher bacterial concentrations on microplastics than on glass controls, though die-off rates did not differ by substrate, demonstrating microplastics' potential to extend pathogen persistence across environmental boundaries.
Assessment of Emerging Pathogens and Antibiotic Resistance Genes in the Biofilm of Microplastics Incubated Under a Wastewater Discharge Simulation
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Researchers incubated common plastic types in flowing water that simulated wastewater discharge conditions for 10 weeks and studied the bacteria that colonized the plastic surfaces. They found that microplastics exposed to treated wastewater developed distinct bacterial communities compared to those in clean river water, including emerging pathogens and antibiotic resistance genes. The study suggests that microplastics in waterways receiving wastewater may serve as mobile platforms for spreading harmful bacteria and antibiotic resistance in the environment.
Pathogens transported by plastic debris: does this vector pose a risk to aquatic organisms?
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This review examined whether microplastics act as vectors for pathogenic bacteria, viruses, and other pathogens in marine and freshwater ecosystems. Evidence indicates that diverse microorganisms including pathogens adhere to microplastic surfaces, and modeling suggested potential for long-range pathogen transport, though the scale of ecological and public health risk remains uncertain.
Selective enrichment of bacterial pathogens by microplastic biofilm
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Researchers incubated biofilms on microplastics and natural substrates in freshwater and found that microplastic surfaces selectively enriched bacterial pathogens and antibiotic resistance genes compared to rock and leaf surfaces. The study suggests that microplastics in waterways may serve as hotspots for harmful bacteria and contribute to the spread of antibiotic resistance in the environment.
The travelling particles: community dynamics of biofilms on microplastics transferred along a salinity gradient
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Researchers studied whether microbial communities living on microplastics can survive when the plastic is transported from one aquatic environment to another — for example, from freshwater to marine systems. The results showed that some community members persisted through environmental transitions, suggesting that microplastics can act as vehicles for dispersing microorganisms across ecosystem boundaries. This has implications for understanding whether microplastics could help spread potentially harmful microbes into new environments.
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