IFNA1 and asthma: The previous trial of inhaled IFN‐β1a had a similar on‐demand design, and Djukanovic et al reported that IFN‐β1a prevented an increase in ACQ‐6 in a subgroup of patients with difficult‐to‐treat asthma (British Thoracic Society steps 4‐5) reporting URTI symptoms.8