Predicting Exposure to Perfluorinated Alkyl Substances (PFAS) among US Infants.

Area of Science:

• Environmental Health
• Toxicology
• Pediatrics

Background:

• Per- and polyfluoroalkyl substances (PFAS) are ubiquitous environmental contaminants detected globally.
• Widespread exposure in US adults is documented, but infant exposure data remains limited.
• Infant serum sample collection is challenging, making exposure assessment difficult.

Purpose of the Study:

• To statistically analyze infant per- and polyfluoroalkyl substance (PFAS) exposures in the US.
• To assess infant serum concentrations using rare data from the National Health and Nutrition Examination Survey (NHANES).
• To address challenges in estimating exposures for vulnerable young populations.

Main Methods:

• Utilized National Health and Nutrition Examination Survey (NHANES) data from 2007-2008.
• Performed statistical and probabilistic analysis on a subset of infant data.
• Examined serum concentrations in relation to infant age, growth, and intake.

Main Results:

• Per- and polyfluoroalkyl substance (PFAS) exposures are extremely common in US infants.
• Serum concentrations remained relatively constant across infants, with notable exceptions.
• Perfluorooctanesulfonic acid (PFOS) concentrations were higher in infants aged 1-3 months compared to newborns, despite weight gain.

Conclusions:

• US infants exhibit widespread per- and polyfluoroalkyl substance (PFAS) exposure.
• Postnatal exposure or differing excretion kinetics may explain elevated perfluorooctanesulfonic acid (PFOS) levels in early infancy.
• Findings highlight the need for further research on early-life chemical exposures and their implications.