Croup

Children and teens, Infections.

How common is Croup in the US?

Modeled average annual rate of parainfluenza virus (PIV)-associated croup hospitalizations among US children under age 5, 1998-2010: 0.4 per 1000 children (US children under age 5 (hospitalizations per 1000 children per year); United States, 1998-2010 (average annual estimate)). Source: Journal of the Pediatric Infectious Diseases Society (CDC), 2014. Label: MODELED.

• 0.4 per 1000 children Modeled average annual rate of parainfluenza virus (PIV)-associated croup hospitalizations among US children under age 5, 1998-2010. Out of: US children under age 5 (hospitalizations per 1000 children per year). Where: United States. When: 1998-2010 (average annual estimate). Counts only parainfluenza-virus-attributable croup hospitalizations (estimated by multiplying national hospitalization counts by PIV-positive proportions from a surveillance network), not all-cause croup, which has multiple viral etiologies (RSV, influenza, rhinovirus, etc.) and includes outpatient/ED-managed cases not requiring hospitalization. Label: MODELED.

  The average annual estimates of PIV-associated bronchiolitis, croup, and pneumonia hospitalizations among children aged <5 years in the United States were 3888 (0.2 hospitalizations per 1000), 8481 per year (0.4 per 1000 children), and 10,186 (0.5 per 1000 children), respectively.

  Source: Estimates of Parainfluenza Virus-Associated Hospitalizations and Cost Among Children Aged Less Than 5 Years in the United States, 1998-2010 Journal of the Pediatric Infectious Diseases Society (CDC), 2014. PubMed 26908486. DOI 10.1093/jpids/piu047.

Each figure measures something different. Do not compare them with each other or with other conditions.

Medical codes

• ICD-10-CM FY2026: J05.0 Acute obstructive laryngitis [croup] (exact)

Research activity

As of 2026-09-24: 41 registered studies on ClinicalTrials.gov (search Croup) and 290 PubMed records, 2021 to 2025. A count of records is not how common or serious the condition is.

Population information, not medical advice. Methodology · Known limitations