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Cellulose/polyester-blended microplastics amplify plastisphere pathogen and antibiotic resistome risks
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Scientists found that certain "blended" microplastics, like those in everyday paper products mixed with polyester, actually grow more bacteria and collect more antibiotic-resistance genes than plain plastics do when tested in wastewater treatment systems. This matters because these tiny particles could help drug-resistant germs multiply and spread, meaning the paper-plastic blends in items we use daily may deserve more attention as a hidden source of antibiotic resistance in our environment.
Microplastics (MPs) are important vectors for antibiotic resistance genes (ARGs) in anaerobic digestion systems, yet the risks posed by cellulose/polyester-blended materials remain poorly understood. In this study, commercial airlaid paper (AP; 45 % cellulose and 55 % polyester), polyethylene (PE), polypropylene (PP), and polystyrene (PS) were incubated in anaerobic reactors for 60 days. Biofilm characterization, extracellular polymeric substances (EPS) analysis, 16S rRNA sequencing, and metagenomics were used to compare plastisphere formation, microbial assembly, ARG/mobile genetic element (MGE) profiles, and potential pathogen composition. Owing to its fibrous structure and bioavailable cellulose fraction, AP exhibited the highest biofilm biomass and EPS content. In contrast, PE, PP, and PS induced stronger interfacial stress, especially PS, as indicated by increased reactive oxygen species, lactate dehydrogenase release, and enrichment of oxidative stress, SOS response, and multidrug efflux pump related genes. Metagenomic analysis showed that fully synthetic MPs mainly enriched multidrug resistance genes, whereas AP selectively enriched polymyxin resistance genes, particularly Mcr-5.1 and Mcr-5.2. AP also exhibited the highest ARG-MGE co-localization rate (12.7 %) and antibiotic resistance risk. Overall, these findings identify polymer composition as a key factor shaping plastisphere resistome assembly and indicate that cellulose/polyester-blended materials require specific consideration in sludge-associated antimicrobial resistance risk assessments.
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Scientists found that different types of microplastics in wastewater treatment plants can boost antibiotic-resistant bacteria in different ways, some plastics helped resistant genes spread more easily between bacteria, making the problem harder to contain. This matters because wastewater treatment plants are supposed to help protect us from pollution, but these findings suggest the type of plastic contamination present could affect how much antibiotic resistance ends up back in our environment, potentially making infections harder to treat down the line.
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Researchers found that microplastics in treated wastewater carry significantly more disease-causing bacteria, antibiotic resistance genes, and virulence factors on their surfaces compared to the surrounding water. This means microplastics released from wastewater treatment plants into rivers and lakes could spread antibiotic-resistant infections, posing a direct risk to communities that rely on these water sources.
Plastisphere as a resistome incubator: Substrate biodegradability escalates compounded genetic risks
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Scientists found that microplastics, especially "biodegradable" ones, can become breeding grounds for bacteria carrying antibiotic resistance genes, sometimes even more than regular plastics. These bacteria also picked up traits that help them spread resistance and cause infections, suggesting that eco-friendly plastics may not be as harmless to health as assumed.
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Scientists found that tiny plastic particles (nanoplastics) combined with certain phosphorus nutrients in water can help bacteria become more resistant to antibiotics, especially at low plastic concentrations that let algae and bacteria communities keep growing while swapping resistance genes. This matters because antibiotic-resistant bacteria are already a growing public health threat, and this research shows that plastic pollution in lakes and rivers—not just antibiotic overuse—could be quietly fueling the problem in ways we didn't fully understand before.
Microplastics accelerate nitrification, shape the microbial community, and alter antibiotic resistance during the nitrifying process
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Researchers found that adding microplastics to wastewater treatment systems actually sped up nitrification (a key step in processing sewage) but also promoted the growth of antibiotic-resistant bacteria. Even biodegradable PLA plastics, often considered more environmentally friendly, significantly increased antibiotic resistance genes. This study warns that microplastics in wastewater systems could be accelerating the spread of antibiotic resistance, a major public health threat.
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