Key Takeaways

  • New research indicates that there are four molecular subtypes of bronchiolitis—the most common lung infection in infants.
  • Children with different subtypes face different risks of later developing asthma.

Our data add significant support to the emerging concept that bronchiolitis represents several diseases with unique biological mechanisms.

Yoshihiko Raita, MD, MMSc
Researcher, Department of Emergency Medicine, Massachusetts General Hospital

BOSTON – 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 bronchiolitis 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 molecular data 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 evidence base 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 asthma.”

This study was funded by the National Institutes of Health and conducted by investigators at MGH, George Washington University, Children’s National Hospital, Boston Children’s Hospital and Baylor College of Medicine.

About the Massachusetts General Hospital
Massachusetts General Hospital, founded in 1811, is the original and largest teaching hospital of Harvard Medical School. The Mass General Research Institute conducts the largest hospital-based research program in the nation, with annual research operations of more than $1 billion and comprises more than 9,500 researchers working across more than 30 institutes, centers and departments. In August 2020, Mass General was named #6 in the U.S. News & World Report list of "America’s Best Hospitals."