The acronym ABPA stands for: allergic bronchopulmonary aspergillosis (ABPA), a disease based on an immunological reaction to fungal antigens, especially from Aspergillus spp. In principle, other fungi can also cause this disease. It is considered the most common cause of pulmonary eosinophilia (see eosinophilic pneumonia below). ABPA occurs in 10-15% of cases complicating cystic fibrosis (cystic fibrosis).