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Abstract The impact of evolving treatment regimens, airway clearance strategies, and antibiotic combinations on the incidence and prevalence of respiratory infection in cystic fibrosis (CF) in children and adolescents remains unclear. The incidence, prevalence, and prescription trends from 2002 to 2019 with 18,339 airway samples were analysed. Staphylococcus aureus [− 3.86% (95% CI − 5.28–2.43)] showed the largest annual decline in incidence, followed by Haemophilus influenzae [− 3.46% (95% CI − 4.95–1.96)] and Pseudomonas aeruginosa [− 2.80%95% CI (− 4.26–1.34)]. Non-tuberculous mycobacteria and Burkholderia cepacia showed a non-significant increase in incidence. A similar pattern of change in prevalence was observed. No change in trend was observed in infants