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Unlabelled: Croup syndrome is an urgent and frequent reason for hospitalization of children., Material and Methods: 632 children with croup syndrome (422 boys and 210 girls aged 2 months-17 years) admitted to 15 pediatric departments in Lower Silesia were prospectively observed for 12 months (from April 2001 to March 2002). We conducted prospective survey of clinical and laboratory data from all study centers., Results: Following diagnoses were accepted as the croup syndrome: subglottic laryngitis in 482 patients (75.4%), laryngotracheobronchitis in 75 (11.8%), laryngitis in 50 (7.8%) and epiglottitis in 20 children (3%). The most severe course was observed in children with epiglottitis. Four of them required airway intervention and had endotracheal intubation. H. influenzae b was cultured from blood of one patient. The most cases of epiglottitis occurred in the 3rd year of life (45%)., Conclusions: 1. The most common reason of croup was subglottic laryngitis. 2. Epiglottitis was rare with serious course of disease; frequency was comparable with the frequency seen in European countries before the implementation of Hib vaccine. The routine use of Hib vaccine in Poland may prevent from children life threatening epiglottis cases.