RT Book, Section A1 Gill, Peter John A1 Wright, Robert Bruce A1 Klassen, Terry A2 Shah, Samir S. A2 Kemper, Alex R. A2 Ratner, Adam J. SR Print(0) ID 1157321585 T1 Croup T2 Pediatric Infectious Diseases: Essentials for Practice, 2e YR 2019 FD 2019 PB McGraw-Hill Education PP New York, NY SN 9781259861536 LK accesspediatrics.mhmedical.com/content.aspx?aid=1157321585 RD 2024/10/07 AB Croup (acute laryngotracheobronchitis) is a respiratory illness of childhood and one of the most common causes of acute stridor in children seen in the office or emergency setting. In North America, croup affects approximately 3% of the population; it is most common in children aged 6 months–6 years, with the largest number of cases occurring in children 1–2 years of age.1,2 The male : female ratio for croup is 1.4 : 1.1 There are two seasonal peaks of croup in North America: the first in autumn and the second in late winter.1 Because of biennial increases in viral epidemics, the number of croup cases is 50% higher in odd-numbered years when compared with even-numbered years.3