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Microplastics selectively modify ranavirus-driven physiological disruption and gut microbiome restructuring in amphibians
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Scientists found that in frogs, a viral infection (ranavirus) caused most of the physical damage, but exposure to microplastics made things worse—weakening immune defenses, disrupting gut bacteria, and helping the virus spread more aggressively, even when the frogs didn't look visibly sick. While this study is on amphibians, it's a warning sign for humans too: microplastics may not directly cause disease, but they could make our bodies more vulnerable when we're already fighting off infections.
Amphibians often face overlapping infectious and environmental stressors that interact with non-equivalent magnitudes. We investigated the combined effects of microplastics (MPs) and ranavirus (RV) on the physiology and gut microbiome of the white tree frog (Litoria caerulea). Using a multiblock approach, we integrated diverse endpoints including corticosterone (CORT), body condition, serum biochemistry, antioxidant activity, and gut microbiome profiles. RV was the major driver of host variation, significantly disrupting body condition, protein homeostasis, bioenergetic budget, and renal/hepatic functions. While direct MP effects include CORT, bioenergetic budget and antioxidant defense, increased MP intensity amplified RV viral load, infection rates, and overall physiological disruption. The gut microbiome exhibited significant structural restructuring in weighted and unweighted UniFrac analyses, despite unchanged alpha diversity. Integrated analysis revealed that exposure history was primarily reflected in host physiology, with microbial features providing secondary, structured signals. We conclude that RV is the primary physiological disruptor, while MPs act as a modifier that exacerbates these responses. These changes represent a hidden cost that increases ecological risk in amphibians, even in the absence of overt clinical signs.
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Researchers used Xenopus frogs—whose immune system parallels key human features—to study how early developmental microplastic exposure affects immune system development, finding disruption of both innate and adaptive immune components with potential relevance to human susceptibility to infection.
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