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Microplastics as vectors for microbial pollutants: Biofilm-associated transfer of pathogens and antibiotic resistance genes in zebrafish intestine
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Scientists found that microplastics coated in bacterial "biofilms" can act like tiny rafts, ferrying harmful germs and antibiotic-resistance genes into the gut, and surprisingly, "biodegradable" plastic (PLA) transferred more of these risky microbes than regular plastic (PP). This matters because it suggests eco-friendly plastics aren't necessarily safer for our health, and swallowing microplastics (through food, water, etc.) could potentially disrupt gut bacteria and contribute to the spread of antibiotic resistance, though this study was done in fish, not humans.
As composite carriers of microorganisms and pollutants, biofilm-attached microplastics (MPs) serve as potential vectors for the environmental migration and biotransmission of antibiotic resistance genes (ARGs) and pathogens. In this study, traditional polypropylene (PP) and biodegradable polylactic acid (PLA) MPs were used to investigate the interference effects of biofilms-attached MPs on gut microbiota and ARGs transmission, through a combination of laboratory biofilm cultivation, zebrafish (Danio rerio) exposure simulations, metagenomic sequencing, and metabolomic profiling. Results showed that MP biofilms likely induced gut dysbiosis and were associated with altered diversity and abundance of pathogens and ARGs. At the phylum level, Nitrospira was transferred from PP biofilms to the gut. At the genus level, 23 genera were transferred from MP biofilms, with PLA (23 genera) showing higher transfer capacity than PP (4 genera). Notably, two human pathogens, one opportunistic pathogen, and two ARGs (adeF and oqxB) were specifically transferred from PLA biofilms, highlighting the unique dissemination risk of biodegradable MPs. Mechanistically, MPs may activate mobile genetic elements (e.g., Tn916 transposon) through metabolic remodeling and quorum sensing, thereby promoting horizontal gene transfer and ARGs dissemination within the gut. Our findings highlight the potential role of MPs as carriers of microorganisms and ARGs, underscoring the biotransmission risks of antibiotic resistance caused by composite pollution.
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Toxicity and Microecological Responses of Daphnia magna and Danio rerio to PVC and PHA Microplastics: Focusing on Trophic Pathogen Enrichment
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Scientists fed microplastics to tiny water fleas, which were then eaten by zebrafish, to see how plastic pollution moves up the food chain. Even though the fish looked healthy on the outside, both "regular" plastic (PVC) and so-called "biodegradable" plastic (PHA) disrupted their gut bacteria, with regular plastic notably promoting the growth of harmful bacteria linked to human infections. This suggests that "eco-friendly" plastics aren't necessarily safe either, and that hidden health risks from microplastics could be traveling through the food chain even when animals appear unaffected on the
Selective enrichment of high-risk antibiotic resistance genes and priority pathogens in freshwater plastisphere: Unique role of biodegradable microplastics
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This study found that biodegradable microplastics like polylactic acid (PLA) -- often marketed as eco-friendly -- actually attracted more dangerous antibiotic-resistant bacteria than conventional plastics in freshwater. The biodegradable plastics selectively enriched high-priority pathogens carrying multiple resistance genes, meaning they could help spread antibiotic resistance through water systems that ultimately affect human health.
Biofilm enhances the interactive effects of microplastics and oxytetracycline on zebrafish intestine
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Researchers found that microplastics coated with bacterial biofilms (natural microbial layers that form in water) caused more intestinal damage to zebrafish than clean microplastics. The biofilm-coated particles increased pathogenic bacteria in the gut by several times and significantly boosted antibiotic resistance genes. This matters because microplastics in real-world water are almost always coated with biofilms, meaning the actual health risks from waterborne microplastics may be greater than lab studies using clean particles suggest.
Microplastic-antibiotic Complex Pollutants on Intestinal Microbial Community Structure of Zebrafish
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Tiny plastic particles in water can soak up antibiotics like a sponge, essentially hitching a ride into the guts of fish and disrupting their natural balance of gut bacteria. This matters because it shows microplastics aren't just passive pollution—they can act as delivery vehicles for other harmful chemicals, and since fish are part of our food chain and share similar gut biology to humans, this raises real questions about what combined pollution might be doing to our own health.
Effects of biodegradable and conventional microplastics on the intestine, intestinal community composition, and metabolic levels in tilapia (Oreochromis mossambicus)
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Researchers exposed tilapia fish to both biodegradable (PLA) and conventional (PVC) microplastics for 14 days and compared the effects on their intestines and gut bacteria. Both types of microplastics caused intestinal inflammation and disrupted the gut microbial community, though the specific effects differed between the two plastic types. The study suggests that biodegradable microplastics may not be substantially safer for aquatic life than conventional ones.
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