Low levels of lead exposure tied to strep throat in kids

A recent study reveals a link between low levels of lead exposure and an increased risk of strep throat in children. Researchers analyzed medical records of over 13,000 children aged 14 or younger in Philadelphia, Pennsylvania, from 2010 to 2020. Blood lead screening data was used to assess lead exposure, while records for clinical diagnoses of strep throat or croup infections were reviewed.

Children with blood lead concentrations ranging from 1 to 3.4 micrograms per deciliter had approximately 2.5 times the odds of being diagnosed with strep throat compared to those with levels under 1 microgram per deciliter. Those at or above the Centers for Disease Control and Prevention's threshold of 3.5 micrograms per deciliter had about 2.7 times the odds of being diagnosed.

No clear association was found between lead exposure and croup. Corresponding author Marina Oktapodas Feiler, an assistant professor of epidemiology and environmental health at the University at Buffalo's SPHHP, points out that health inequities and structural barriers in older cities contribute to the problem, as homes may contain deteriorating lead paint.

Renters and lower-income individuals are disproportionately affected, as they often cannot afford necessary renovations to remove lead. The study, published in the Journal of Exposure Science and Environmental Epidemiology, suggests that environmental lead exposure during childhood can adversely affect immune system development and increase susceptibility to respiratory illnesses.

While the evidence linking lead exposure to respiratory outcomes in children remains inconclusive, the research highlights the adverse effects on children's developing immune systems. Even at blood lead levels below CDC's intervention threshold, lead exposure has been shown to damage children's immune systems.