Changes in the nasopharyngeal and oropharyngeal microbiota in pediatric obstructive sleep apnea before and after surgery: a prospective studyOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
This prospective study examined the nasopharyngeal and oropharyngeal microbiota in children with obstructive sleep apnea (OSA) compared to children without OSA. The researchers used 16S rRNA V3-V4 gene sequencing to characterize microbial communities at different anatomical sites of the upper airway. They also assessed how surgical treatment, adeno-tonsillectomy, altered the oropharyngeal microbiome one month after surgery. Correlation analysis linked microbial composition to clinical measures of disease severity.
Who was studied?
The study included 30 children with OSA and 10 children without OSA (non-OSA controls) who were undergoing adeno-tonsillectomy. Throat swab samples were collected from different parts of the oropharynx and nasopharynx in both groups before surgery. A follow-up oropharyngeal sample was collected from the same patients one month after their adeno-tonsillectomy.
What were the most important findings?
Alpha diversity differed significantly across upper airway sites in children with OSA, but this site-to-site difference was not observed in non-OSA children. Beta diversity also differed significantly between the OSA and non-OSA groups, and genus-level composition varied by anatomical site differently in each group. Notably, the relative abundance of Neisseria was significantly correlated with the obstructive apnea hypopnea index, a measure of OSA severity. Functional prediction analysis suggested that microbial pathways related to cell proliferation and material metabolism were implicated, though the abstract text is truncated at this point.
What are the greatest implications of this study?
These findings suggest that pediatric OSA is associated with distinct, site-specific shifts in upper airway microbial communities rather than a uniform, whole-airway change. The correlation between Neisseria abundance and apnea severity raises the possibility that specific airway taxa could serve as biomarkers or contributors to OSA pathophysiology in children. Tracking oropharyngeal microbiota after adeno-tonsillectomy may help clarify whether surgical correction of anatomical obstruction also normalizes microbial imbalances. This abstract does not mention Desulfovibrio, sulfate-reducing bacteria, hydrogen sulfide, sulfide, or sulfur metabolism, so no such angle applies here.