We did not find a difference between HFNC and nCPAP in the management of severe bronchiolitis in our PICU. Larger prospective studies are required to confirm these findings.

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• In children with a negative CF NBS referred to a university hospital for respiratory diseases, despite important variations of ST methods, only 4 children among 502 have been diagnosed as CF. • Despite recommendations, ST prescription should be avoided in children with moderate to severe asthma and no other associated symptom.