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Aquatic Plastisphere as a Reservoir for Pathogenic and Antifungal-Resistant Fungi
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Scientists found that plastic waste floating in urban waterways is covered in harmful fungi—including several types the World Health Organization flags as top health threats—and many of these fungi are already resistant to antifungal drugs. Lab tests confirmed these drug-resistant fungi are alive and thriving on plastic surfaces more than in the surrounding water, suggesting plastic pollution may help spread hard-to-treat fungal infections. This matters because it points to plastic waste as an overlooked way that dangerous, drug-resistant germs travel through our environment and potentially reach people.
High Resolution Image Download MS PowerPoint Slide Plastic pollution creates a globally distributed “plastisphere” microhabitat, yet its role in fostering antifungal resistance, a rapidly emerging One Health threat, remains poorly understood. Here, we tested whether aquatic plastic debris harbors potentially pathogenic fungi with antifungal resistance traits through combined shotgun metagenomics, culture-based validation, antifungal susceptibility testing, and isolate whole-genome sequencing. Diverse fungal assemblages were detected in the plastisphere from urban and peri-urban water bodies, including 32 FungAMR-curated pathogenic species, 13 of which are listed as WHO priority fungal pathogens. All 32 pathogenic species had contigs carrying at least one known resistance-conferring amino acid substitution, indicating widespread resistance potential across the detected pathogenic assemblage. Culture-based assays confirmed viable high-risk fungi, including Aspergillus fumigatus, Fusarium oxysporum, and Candida parapsilosis, with their isolates exhibiting multidrug-resistant phenotypes in MIC tests against 11 antifungal agents. Cross-substrate comparison further showed higher burdens of fungi carrying resistance-associated substitutions on microplastics than in bulk water. These findings indicate that the aquatic plastisphere potentially acts as a reservoir and dispersal vehicle for antifungal-resistant fungal pathogens, highlighting an overlooked dimension of plastic pollution with One Health relevance.
More Papers Like This
Aquatic Plastisphereas a Reservoir for Pathogenicand Antifungal-Resistant Fungi
AI summary Read the abstract
Scientists found that plastic debris floating in urban waterways is coated with a slimy microbial film that harbors disease-causing fungi—including some already flagged by the WHO as high-risk—many of which showed resistance to common antifungal drugs. This matters because it suggests plastic pollution isn't just an environmental problem; it may also be helping drug-resistant fungal infections spread and hitch rides through our water systems, making them harder to treat if they reach people.
A comprehensive pan-European exploration of fungal plastisphere dynamics along river-to-sea continuums.
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Scientists studied how fungi hitch a ride on microplastic pollution as it travels from European rivers into the ocean, finding that plastic debris hosts its own distinct fungal communities different from those in surrounding water. The good news: potentially harmful fungi found on river plastics didn't appear to make the journey out to sea, suggesting the ocean environment naturally limits their spread. This matters because it shows microplastics aren't just passive pollutants—they can transport living organisms across ecosystems, though this particular study suggests that risk may be more contained than feared.
The ecology of the plastisphere: Microbial composition, function, assembly, and network in the freshwater and seawater ecosystems
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Researchers studied the communities of bacteria and fungi that colonize microplastic surfaces in freshwater and seawater, forming what scientists call the plastisphere. These microplastic-associated communities were distinctly different from those in surrounding water, and included a higher proportion of disease-causing organisms and species involved in pollutant degradation. The findings suggest that microplastics create new habitats that can harbor pathogens and alter natural microbial ecosystems in ways that may affect water quality and human health.
Fungal plastiphily and its link to generic virulence traits makes environmental microplastics a global health factor
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This meta-analysis reveals that microplastics in soil serve as hotspots where disease-causing fungi accumulate and thrive. The findings are concerning because many of the fungi that colonize microplastics share traits with human pathogens, suggesting that plastic pollution may be creating new breeding grounds for infectious disease in the environment.
Microbial hitchhikers on microplastics: The exchange of aquatic microbes across distinct aquatic habitats
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This study investigated how microorganisms hitchhike on microplastics as they move between river and ocean environments, finding that plastic surfaces were colonized by pollutant-degrading bacteria and plastic-degrading fungi. The mere presence of microplastics in seawater increased the abundance of planktonic fungi from 2% to 25%, showing that microplastics significantly alter microbial communities. This matters for human health because microplastics can transport potentially harmful microorganisms across different water environments, including those used for drinking water and aquaculture.
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