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Microplastics exacerbate virus-mediated mortality in fish
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Researchers discovered that microplastics can significantly worsen virus-related mortality in fish, finding that salmonids co-exposed to a virus and microplastics, particularly microfibers, died at higher rates than fish exposed to the virus alone. Natural non-plastic microparticles did not produce the same effect, indicating a plastic-specific interaction. The study presents evidence that microplastic pollution may amplify the impacts of infectious disease in aquatic populations.
Microplastics are a persistent and increasing environmental hazard. They have been reported to interact with a variety of biotic and abiotic environmental stressors, but the ramifications of such interactions are largely unknown. We investigated virus-induced mortalities in a commercially important salmonid following exposure to microplastics, plastic microfibers, and natural (non-plastic) microparticles. Microplastics or microparticles alone were not lethal. Mortality increased significantly when fish were co-exposed to virus and microplastics, particularly microfibers, compared to virus alone. This presents the unique finding that microplastics (not natural microparticulate matter) may have a significant impact on population health when presented with another stressor. Further, we found that mortality correlated with host viral load, mild gill inflammation, immune responses, and transmission potential. We hypothesize that microplastics can compromise host tissues, allowing pathogens to bypass defenses. Further research regarding this mechanism and the interplay between microplastics and infectious disease are paramount, considering microplastics increasing environmental burden.
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Tiny plastic fibers floating in the environment can make viral infections much more dangerous than plastic beads or viruses alone, but only if you're exposed to them for a long time before and after getting sick. Scientists think this happens because the plastic fibers damage the protective lining in your body (or fish gills in this study), making it easier for viruses to cause serious harm. This matters because microplastics are everywhere in our air and water, so understanding how they interact with infections could help protect people's health, especially in places like fish farms where both microplastics and viruses are present.
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Researchers exposed koi carp to polystyrene nanoplastics and koi herpesvirus simultaneously and found that nanoplastic exposure enhanced viral replication by 3–5-fold at the protein level and 8–10-fold at the gene expression level, suggesting nanoplastic pollution can increase susceptibility to viral disease in fish.
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Researchers found that micro- and nanoplastics significantly enhanced the survival and infectivity of bacteriophage D1 in aquatic environments, with the effect positively correlated with microplastic concentration and varying by particle type, size, and environmental conditions.
The Toxicity of Polyethylene Microplastic Exposure and Its Concurrent Effect With Aeromonas Hydrophila Infection To Zebrafish
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This study exposed adult zebrafish to polyethylene microplastics while simultaneously infecting them with Aeromonas hydrophila bacteria, a common fish pathogen. Microplastic exposure worsened bacterial infection outcomes, suggesting that plastic pollution may reduce fish immune defenses. The interaction between microplastic contamination and disease susceptibility is relevant to understanding how pollution affects aquatic ecosystem health.
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Researchers showed that polystyrene nanoplastics synergize with Largemouth bass ranavirus in fish cells, accelerating viral replication, amplifying oxidative stress and inflammation, and suppressing the cGAS-STING antiviral immune pathway — suggesting nanoplastics may worsen infectious disease outcomes in freshwater fish.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.