A multi-pathogen behavioral exposure model for young children playing in public spaces in developing communities

Area of Science:

• Environmental health
• Pediatric infectious diseases
• Global child health

Background:

• Diarrheal disease remains a leading cause of mortality in children under five in developing regions.
• Existing water, sanitation, and hygiene (WASH) interventions show limited impact, indicating a need for novel approaches.
• Public spaces in informal settlements are often contaminated with feces and waste, posing potential exposure risks.

Purpose of the Study:

• To investigate pathogen exposure risks for young children playing in public spaces in informal settlements.
• To quantify the association between environmental contamination, child behavior, and pathogen exposure.

Main Methods:

• Collected and analyzed 79 soil samples from Corail, Haiti, using cultural assays and quantitative Polymerase Chain Reaction (qPCR).
• Screened environmental samples for specific pathogens including Aeromonas, Vibrio cholera, and pathogenic Escherichia coli species.
• Conducted behavioral observations of children under five in relation to environmental sampling sites.

Main Results:

• Children have a ~70% likelihood of pathogen exposure and >30% chance of multiple exposures during one hour of play.
• Higher pathogen exposure likelihood and dose observed in toddlers and older children compared to infants.
• Strong correlation found between genes of the same Escherichia coli species in environmental samples.

Conclusions:

• Public spaces represent a significant, under-addressed exposure pathway for enteric pathogens in young children.
• Findings underscore the necessity of integrating public space considerations into future research and public health interventions.
• Novel strategies are required to mitigate pathogen exposure risks beyond traditional WASH programs.