Bronchiolitis
A common lower-respiratory infection in infants and toddlers, most often caused by RSV, that inflames the small airways of the lungs.
Common symptoms
- Runny nose
- Cough
- Wheezing
- Rapid breathing
- Fever
- Poor feeding
Cause
Usually RSV, but also rhinovirus, parainfluenza, and human metapneumovirus.
How common is it?
Peaks late fall through early spring; most children get RSV by age 2.
Treatment
Supportive care: hydration, nasal saline and suction, humidified air, and fever control. Some infants need hospital care for oxygen or IV fluids.
Prevention
Frequent handwashing, avoiding smoke exposure, keeping infants away from sick contacts, RSV monoclonal antibody (nirsevimab) for eligible infants.
See what's going around
Track Bronchiolitis and other illnesses at your child's school in real time.
Frequently asked questions
Bronchiolitis articles for parents
- October 2025When Should Kids Stay Home from School?Guidelines to help parents make the tough call about keeping sick kids home.
- December 2025Managing School Sick Days: A Chicago Working Parent's Survival GuideWhen your child is sick and you have work, something has to give. Practical strategies for Chicago parents juggling careers and caregiving.
Related illness guides
Medical disclaimer: Educational only. Always consult a healthcare provider for diagnosis and treatment.