The difference of oropharyngeal microbiome during acute respiratory viral infections in infants and childrenOriginal 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 study asked whether the throat microbiome differs during acute respiratory viral infection in young children. Researchers profiled oropharyngeal swabs using whole-genome shotgun metagenomic sequencing. They compared microbes by disease severity, using hospitalization as the severity marker. They also compared by symptoms and by the specific respiratory virus detected. Seven common viruses were included: influenza, RSV, human rhinovirus, parainfluenza, adenovirus, metapneumovirus, and enterovirus. A virus-undetectable group served as comparison. Taxa, diversity, community types, and metabolic pathways were analyzed.
Who was studied?
The study enrolled infants and children under 12 years with acute respiratory infection from six hospitals in Chongqing, China, between October 2021 and April 2022. After quality filtering, 109 oropharyngeal samples were analyzed. These comprised 49 inpatients and 60 outpatients, matched by age and sex. Most were aged 0 to 5 years, and slightly over half were male. All had a single confirmed respiratory virus or no detectable virus. Children were healthy and term-born, without vomiting or diarrhea. Those who had taken antiviral drugs before the visit were excluded.
What were the most important findings?
Overall alpha diversity did not differ by severity, but beta diversity differed significantly by severity, symptoms, and virus type. Disease severity explained the most community variation. Nine species were significantly more abundant in outpatients than inpatients, five of them in the genus Achromobacter. No taxa were enriched in inpatients. Three community types emerged. Type 1 was more common with influenza, enterovirus, and adenovirus; type 2 with metapneumovirus; type 3 with RSV and adenovirus. L-arginine metabolism pathways were higher in outpatients.
What are the greatest implications of this study?
The findings suggest the throat microbiome is associated with how severe a child's respiratory viral infection becomes and with which virus is present. This is the first shotgun-sequencing description of the oropharyngeal microbiome for metapneumovirus, parainfluenza, adenovirus, and enterovirus infections. Because the design was cross-sectional, causation cannot be established. The authors cannot tell whether infection reshaped the microbiome or whether the microbiome predisposed children to more severe disease. The small sample limited power within individual virus groups. Larger longitudinal studies are needed to track microbiome dynamics during infection.