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Plastisphere as a global hotspot for antimicrobial resistance: Systematic review and quantitative synthesis
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Bacteria growing on floating plastic waste swap antibiotic-resistance genes almost 7 times faster than usual, with PVC plastic being the worst offender. This review of 53 studies suggests plastic pollution may be helping create drug-resistant germs in the environment, though it's not yet proof this directly makes people sick, more research is needed.
Plastic debris provides colonizable surfaces for microbial biofilms, the plastisphere, which is now recognized as a hotspot for antimicrobial resistance (AMR) amplification and dissemination. This PRISMA 2020-compliant synthesis covers 53 studies. Random-effects meta-analysis of 30 conjugation datasets showed enhanced horizontal gene transfer: pooled log response ratio (lnRR) = 1.93 (95% CI: 1.63–2.23), 6.9-fold (95% CI: 5.1–9.3-fold); heterogeneity was high (I 2 = 85.0%; τ 2 = 0.573; Q = 187.6, df = 29) and the 95% prediction interval spanned 1.5–31.3-fold. Polyvinyl chloride (PVC) biofilms showed the largest sub-group effect (lnRR = 2.72; 95% CI: 1.84–3.60; 15.2-fold), and polymer type was significant as a categorical moderator (Q M = 12.3, P = 0.006; R 2 = 29%) but not as a continuous ordinal score ( P = 0.15). Antibiotic resistance gene (ARG) concentrations exceeded paired controls by one to three orders of magnitude (median log 10 enrichment 1.98; 95-fold). Ampicillin resistance in plastisphere-associated Vibrio spp. reached 68.4% (Wilson 95% CI: 57.3–77.8%), with 32.9% multidrug-resistant. A conceptual five-stage genetic reactor lifecycle model is proposed as a heuristic, not a validated framework, identifying dispersal as the least-evidenced stage. A polymer risk hierarchy (PVC > polyethylene (PE) > polystyrene (PS), with polyethylene terephthalate (PET) lowest for ARG enrichment), an exposure–response framework and four Tier-1 knowledge gaps are established. The evidence base is geographically skewed (38% of studies from Chinese systems), and these estimates describe environmental enrichment, not realized clinical risk. They nonetheless justify incorporating polymer-additive regulation and plastisphere resistome surveillance into One Health strategies and the UN Plastics Treaty.
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Marine plastisphere selectively enriches microbial assemblages and antibiotic resistance genes during long-term cultivation periods
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Researchers placed four types of common microplastics in a marine environment for over 100 days and found that bacterial communities and antibiotic resistance genes accumulated on the plastic surfaces over time. PVC microplastics were particularly effective at concentrating resistance genes, and a key gene-transfer element was found on all plastic types. These results show that microplastics floating in the ocean act as hotspots for antibiotic-resistant bacteria, which could eventually reach humans through seafood or water.
Plastic pollution and antimicrobial resistance: an emerging link with major implications
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Tiny bits of plastic in our environment aren't just pollution—they may also be creating breeding grounds where bacteria swap genes that make them resistant to antibiotics. This paper (a review of existing research) argues that these "plastic hotspots" are being ignored by current efforts to track and fight drug-resistant germs, even though they could be helping antibiotic resistance spread faster through water, soil, and eventually into humans and animals. The takeaway: tackling plastic pollution and antibiotic resistance may need to become a joint effort, not two separate problems.
Antibiotic resistance in plastisphere
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Researchers reviewed antibiotic resistance in the plastisphere — the microbial community colonizing plastic surfaces in aquatic environments — finding that plastic properties and aging influence the enrichment and horizontal transfer of antibiotic resistance genes, and that aged microplastics pose elevated risks due to increased adsorption of resistant bacteria.
Antibiotic resistant bacteria colonising microplastics in the aquatic environment: An emerging challenge
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Researchers reviewed how microplastics in aquatic environments act as surfaces where antibiotic-resistant bacteria can grow and swap resistance genes with each other, raising concern that contaminated seafood and water could transfer these hard-to-treat bacteria to humans.
The Microplastic–biofilm–resistome Nexus: the Role of Environmental Microplastics in the Formation and Dissemination of Antibiotic-resistant Bacteria and the Potential Consequences for Human Health
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Tiny plastic particles floating in water and soil aren't just pollution, they can act like rafts where bacteria cluster together and swap genes that help them resist antibiotics. This review pulls together existing research suggesting that these plastic-bacteria communities could be a hidden pathway for drug-resistant "superbugs" to spread through the environment and potentially reach humans. While more research is needed to confirm the real-world health risk, it's a reminder that plastic pollution may have ripple effects beyond what we can see.
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