Enteroaggregative Escherichia coli Subclinical Infection and Coinfections and Impaired Child Growth in the MAL-ED...

Area of Science:

• Pediatric Infectious Diseases
• Global Child Health
• Microbiome Research

Background:

• Subclinical infections in infancy can have long-term health consequences.
• Enteroaggregative Escherichia coli (EAEC) is a recognized enteric pathogen.
• Early life enteric infections are linked to impaired child growth and development.

Purpose of the Study:

• To assess the impact of subclinical EAEC infection, alone and with co-pathogens, on infant growth.
• To investigate the relationship between EAEC co-infections and inflammatory markers.
• To explore the socioeconomic and environmental factors associated with EAEC co-infections.

Main Methods:

• Longitudinal study of 1684 infants across 8 international sites (MAL-ED study).
• Monthly testing for enteric pathogens, with intensive follow-up in the first 6 months.
• Analysis of growth parameters (weight-for-length, weight-for-age) and inflammatory markers (myeloperoxidase, neopterin).

Main Results:

• Subclinical EAEC infection alone did not alter growth up to 6 months.
• EAEC co-infection with other pathogens was associated with reduced weight-for-length and weight-for-age z-scores.
• Frequent co-infections included Campylobacter spp., enterotoxigenic E. coli, and Cryptosporidium spp.
• EAEC co-infection correlated with increased myeloperoxidase and decreased neopterin levels.
• Maternal factors like lower education, poor sanitation, and lower socioeconomic status were linked to EAEC co-infections.

Conclusions:

• Subclinical EAEC infections, particularly when co-occurring with other pathogens, pose a significant public health risk to early infant growth.
• Interventions targeting maternal and child care, hygiene, sanitation, and socioeconomic factors are crucial.
• Further research into the complex interplay of enteric pathogens and host factors in early life is warranted.