Introduction: Opportunistic pathogen infection is one of the important inducements for asthma exacerbation. Pseudomonas aeruginosa (PA) is a kind of dominant pathogenic bacteria in the respiratory tract that is associated with severe asthma, but the underlying mechanisms still remains unclear.
Objectives: To examine the role of PA infection in the bias of the inflammatory endotype in asthma and its effect on the sensitivity to steroid therapy.