Background: Aspergillus sensitization (AS) and allergic bronchopulmonary aspergillosis (ABPA) can occur as a cause of permanent lung damage in patients with cystic fibrosis (CF) and non-CF bronchiectasis. 
Objective: The aim of this study was to determine the frequency of AS and ABPA in patients with CF and non-CF bronchiectasis in southwestern Iran. 
Methods: This cross-sectional study was conducted on 33 patients with CF and 27 patients with non-CF bronchiectasis from southwestern Iran who were referred to Namazi Hospital affiliated to Shiraz University of Medical Sciences from July 2015 to February 2016. Skin prick test to Aspergillus fumigatus, peripheral blood eosinophil count, total serum IgE, specific IgE and IgG against Aspergillus fumigatus as well as radiologic chest studies were done for each patient. Statistical analysis was done by Mann-Whitney U test, Fisher Exact test, and Kappa weighted in SPSS software version 18. Level of significance was set at p<0.05.
Results: Nine patients with CF (27.3%) and one patient with non-CF bronchiectasis (3.7%) had positive skin tests to Aspergillus. There was 81.2% agreement between positive skin test and specific IgE to Aspergillus fumigatus (p<0.001). Three patients with CF (9%) met the diagnostic criteria for ABPA, whereas ABPA was not seen in patients with non-CF bronchiectasis.
Conclusion: ABPA was low in this study, considering more frequency of AS in patients with cystic fibrosis, clinicians should keep in mind the diagnosis of ABPA for those CF patients that do not respond to usual medical therapy and have positive skin tests to Aspergillus allergens.


Keywords: Aspergillus, Allergic bronchopulmonary aspergillosis, Bronchiectasis, Cystic fibrosis, Fungal antibodies


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