Common lung infection in infants has different subtypes with differing asthma risks

Credit: Pixabay/CC0 Public Domain

Bronchiolitis—the most common lung infection in young children, and which is most often caused by respiratory syncytial virus, or RSV—is the leading cause of hospitalizations in U.S. infants, and about 30% of those with severe bronchiolitis later develop asthma. A team led by investigators at Massachusetts General Hospital (MGH) has uncovered four distinct molecular subtypes of RSV bronchiolitis and has linked a certain subtype to a higher asthma risk. The findings are published in Nature Communications.

"While has been considered a single disease with similar mechanisms, emerging evidence has suggested that bronchiolitis consists of multiple disease subgroups," says lead author Yoshihiko Raita, MD, MMSc, a researcher in the MGH Department of Emergency Medicine. "But our limited understanding of RSV bronchiolitis, and how it varies, has held up efforts to develop RSV bronchiolitis treatment and asthma prevention strategies."

To provide insights, Raita and his colleagues analyzed diverse clinical, genetic and from 221 infants hospitalized with RSV bronchiolitis who were followed until five years of age. The scientists gathered information on the viruses that had infected the children, as well as information on the microbes, metabolites and immune response-related molecules present in the children's nasal passages.

Based on their analyses, four biologically and clinically meaningful subtypes, or endotypes, of RSV bronchiolitis exist. Of these, one endotype—which is characterized by coinfection by rhinovirus, dominance by specific bacteria, and high interferon (antiviral) response—had an approximate 40% risk of developing asthma by age five.

"Our data add significant support to the emerging concept that bronchiolitis represents several diseases with unique biological mechanisms," says Raita. "For clinicians, our findings give an for the early identification of high-risk children during an important period of airway development: Early infancy. For researchers, our data offer new avenues for the development of subgroup-specific strategies—such as fine-tuning the airway immune response and microbiome—for treating bronchiolitis and preventing ."

More information: Yoshihiko Raita et al, Integrated omics endotyping of infants with respiratory syncytial virus bronchiolitis and risk of childhood asthma, Nature Communications (2021). DOI: 10.1038/s41467-021-23859-6

Journal information: Nature Communications
Citation: Common lung infection in infants has different subtypes with differing asthma risks (2021, June 14) retrieved 25 April 2024 from
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Explore further

AAP updates guidelines for bronchiolitis in infants


Feedback to editors