Prevalence of A spergillus sensitization and allergic bronchopulmonary aspergillosis in cystic fibrosis: systematic review and meta‐analysis

Summary Background The prevalence of A spergillus sensitization ( AS ) and allergic bronchopulmonary aspergillosis ( ABPA ) in cystic fibrosis ( CF ) has been varyingly reported. The aim of this systematic review was to estimate the overall prevalence of AS / ABPA in CF . Methods We searched the PubMed and EmBase databases for studies reporting the prevalence of AS / ABPA in CF . We calculated the proportion with 95% confidence interval ( CI ) to assess the prevalence of AS and ABPA in the individual studies and then pooled the results using a random effects model. Statistical heterogeneity was assessed using the I 2 test while publication bias was assessed using both graphical and statistical methods. Results Our search yielded 64 eligible studies. The pooled prevalence of AS was 39.1% (95% CI : 33.3–45.1) and was higher with skin test compared to specific IgE (43.8% vs. 32.8%, P  = 0.002); however, the prevalence did not vary with the type of skin test used (intradermal or percutaneous). The prevalence of ABPA was 8.9% (95% CI : 7.4–10.7) and was higher in adults as compared to children (10.1% vs. 8.9%, P  < 0.0001). There was a wide variation in the criteria used for diagnosing ABPA . Almost 50% (12/23) of the publications after 2004 used criteria other than the CF foundation criteria for diagnosing ABPA . There was significant statistical heterogeneity and evidence of publication bias. Conclusions There is a high prevalence of AS and ABPA in patients with CF . Despite six decades of research, there is still a need to adopt uniform methodology and criteria for the diagnosis of AS / ABPA .