Among school-aged children co-exposed to bisphenol S, triclosan (TCS), and methylparaben, elevated AST/ALT ratios — a marker of liver stress — were consistently associated with the EDC mixture using both g-computation and Bayesian kernel machine regression models. TCS was the dominant driver, and mediation analysis identified the sulfate-reducing bacterium Desulfovibrio as accounting for 48.5% of TCS's effect on AST/ALT, suggesting a gut-liver axis mechanism central to the toxicity pathway.
This finding is notable for quantifying a specific microbial intermediary rather than merely correlating microbiome disruption with disease, a methodological step forward in environmental pediatric health research. Desulfovibrio produces hydrogen sulfide and lipopolysaccharides that are known to promote hepatic inflammation via portal circulation — a plausible biological mechanism consistent with prior animal literature. Triclosan, once ubiquitous in antibacterial soaps before partial regulatory restrictions, persists widely in personal care products and food-contact materials, making pediatric exposure ongoing and underappreciated.
Critical limitations apply: this is cross-sectional and observational, precluding causal inference. AST/ALT elevation is subclinical here, not frank liver disease. Unmeasured confounders — diet, antibiotic history, socioeconomic factors — could influence both microbiome composition and liver enzymes. Cohort size is not specified in the abstract. Still, identifying Desulfovibrio as a quantifiable mediating link elevates this beyond confirmatory work, making it a meaningful mechanistic signal warranting longitudinal follow-up and potential regulatory reconsideration of triclosan in children's environments.