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Microplastics exacerbate virus-mediated mortality in fish. | LitMetric

AI Article Synopsis

  • Microplastics are an environmental problem that interacts with other stressors and may affect wildlife health.
  • A study found that microplastics increased virus-induced deaths in salmon when combined with a viral infection, especially when using microfibers.
  • The presence of microplastics may weaken fish defenses against pathogens, indicating a need for more research on their impact and interactions with diseases.

Article Abstract

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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Source
http://dx.doi.org/10.1016/j.scitotenv.2022.161191DOI Listing

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