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01-06-2023 | Pneumonia | RESEARCH

Characteristics of the oropharyngeal microbiota among infants with pneumonia and their effects on immune response and subsequent respiratory morbidity

Authors: Huihui Hong, Libo Wang, Yuanyuan Qi

Published in: European Journal of Pediatrics | Issue 8/2023

Abstract

Changes in airway microbiota among infants with pneumonia and their impact on subsequent respiratory health are largely unknown. The present study aimed to analyze the oropharyngeal microbiota of infants with pneumonia and to explore the impact of disturbances of the microbiota on disease severity and long-term respiratory morbidities. The oropharyngeal microbiome was characterized using 16S ribosomal RNA-based sequencing, while serum immune mediators were assessed using cytometric bead array, and invariant natural killer T (iNKT) cells were detected using flow cytometry in infants with pneumonia < 6 months of age. Patients were followed up to 3 years of age, and clinical and respiratory morbidity data were collected. A total of 106 infants with pneumonia were enrolled in this study. Diversity of the respiratory microbiota was inversely correlated with the severity of pneumonia and length of hospitalization. Patients who experienced wheezing during pneumonia exhibited lower percentages of total iNKT cells, CD8-positive ( +), and CD4-CD8- subsets, and higher CD4 + subsets than those without. The relative abundances of Prevotella and Veillonella species were lower in patients with severe pneumonia. The abundance of Veillonella was higher in patients who experienced wheezing during pneumonia and in those with subsequent recurrent wheezing than in those without wheezing. The relative abundance and total counts of Bifidobacterium, Lactobacillus, and Neisseria were higher in patients who did not experience subsequent recurrent wheezing.

Conclusions: Diversity of the respiratory microbiota was inversely associated with pneumonia severity, and the percentage of iNKT cells was associated with wheezing during pneumonia. Several species may be associated with subsequent respiratory morbidities and warrant further investigation.

What is Known:

• Early life airway microbiota symbiosis affects the severity of respiratory infection and the risk for the development of asthma.

• Changes in airway microbiota among infants with pneumonia and their impact on subsequent respiratory health are largely unknown.

What is New:

• The diversity of the airway microbiome was inversely associated with the severity of pneumonia and length of hospitalization.

• The abundance of Veillonella was higher in patients who experienced wheezing during pneumonia and in those with subsequent recurrent wheezing.

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Title: Characteristics of the oropharyngeal microbiota among infants with pneumonia and their effects on immune response and subsequent respiratory morbidity
Authors: Huihui Hong
Libo Wang
Yuanyuan Qi
Publication date: 01-06-2023
Publisher: Springer Berlin Heidelberg
Keywords: Pneumonia
Respiratory Microbiota
Bronchial Asthma
Published in: European Journal of Pediatrics / Issue 8/2023
Print ISSN: 0340-6199
Electronic ISSN: 1432-1076
DOI: https://doi.org/10.1007/s00431-023-05037-6

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Characteristics of the oropharyngeal microbiota among infants with pneumonia and their effects on immune response and subsequent respiratory morbidity

Abstract

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Abstract

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