Parainfluenza (Croup)
Parainfluenza, often known as Croup, is a common respiratory illness in young children that causes swelling around the voice box, windpipe, and bronchial tubes. This swelling makes breathing difficult and leads to a distinctive barking cough. It's usually a mild illness but can sometimes cause more severe breathing problems.
Common symptoms
- Barking cough (often described as sounding like a seal)
- Hoarse voice
- Noisy breathing (stridor), especially when inhaling
- Fever (usually low-grade)
- Runny nose and congestion
- Sore throat
- Difficulty breathing (in more severe cases)
Cause
Croup is caused by a viral infection, most commonly the parainfluenza virus. Other viruses, like RSV, adenovirus, and influenza, can also cause croup.
How common is it?
Croup affects approximately 3-5% of children ages 6 months to 3 years annually, making it one of the most common causes of respiratory illness in toddlers. Peak incidence occurs in fall and early winter. Most children experience croup at least once before age 6.
Treatment
Most cases of croup can be managed at home. Focus on keeping your child comfortable and breathing easily: offer cool mist from a humidifier or a steamy bathroom, give plenty of fluids, and use acetaminophen or ibuprofen for fever and discomfort (check with your doctor for appropriate dosing). If breathing difficulties worsen, seek medical attention immediately.
What parents keep on hand
These are everyday supplies parents tell us they like to have on hand, not medical advice. Nothing here diagnoses or treats anything. Always follow your pediatrician's guidance, and check labels for your child's age and weight.
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- Cool-mist humidifierMoist air eases a dry cough and a raw throat overnight.
Frida Baby 3-in-1 Cool Mist HumidifierLarge-room cool mist with 60-hour runtime, a calming nightlight, and an essential oil diffuser. Auto shut-off and a carry handle make nursery use simple.
Crane Ultrasonic Cool Mist HumidifierQuiet ultrasonic mist for a baby nursery or kids' room. One-gallon tank runs up to 24 hours; filter is optional to save on replacements.
Prevention
To prevent the spread of parainfluenza and other respiratory viruses, encourage frequent handwashing with soap and water, especially after coughing or sneezing. Avoid close contact with sick individuals, and teach children to cough or sneeze into their elbow or a tissue. Keep your child home from school or daycare when they are sick to prevent infecting others.
See what's going around
Track Parainfluenza (Croup) and other illnesses at your child's school in real time.
Frequently asked questions
Parainfluenza (Croup) articles for parents
- December 2025That Barking Cough: Croup in Chicago Kids This WinterIs your child's cough sounding like a seal? Croup cases are rising in Chicago. Here's what parents need to know about this common respiratory illness.
- 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.