ArticlemedRxiv : the preprint server for health sciences2026
Microbial and immune determinants of disease severity and death in pediatric pneumonia.
Article in medRxiv : the preprint server for health sciences, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Pneumonia is a leading cause of death globally and disproportionately affects children in lower- and middle-income countries. To explore microbial and immune correlates of disease and death, we performed metagenomic sequencing of upper respiratory tract (URT) microbiome in 309 children in Mali with pneumonia and 150 age- and season- and site-matched controls. We show that the URT microbiome matures throughout early life and is influenced by breastfeeding. URT microbiome maturation was disrupted during pneumonia resulting in loss of commensal species and expansion of pathobionts, which was linked to disease severity and death. Analysis of serum antibody levels revealed that low levels of passively acquired antibody from mothers, deficient antibody responses to RSV, and persistent autoantibody to cytokines were associated with pneumonia mortality in an age-dependent manner. These findings underscore the complex nature of pneumonia and identify microbial and immune factors for risk stratification and therapeutic interventions in pediatric pneumonia.
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