Background: Aeroallergens and food allergens play a key role in the pathogenesis of asthma; they are the target for future immunotherapy worldwide. Food allergens have been studied often in Egypt, but data are defective concerning the prevalent Egyptian aeroallergens that can be affected by the climatic conditions in Egypt. So, our study aimed to explore the dominant sensitizing aeroallergens in Egyptian patients with bronchial asthma.Methods: Cross-sectional study performed on 122 Egyptian asthmatic patients. Sera from all patients were examined by enzyme allegro sorbent test (EAST) method for specific IgE to a panel of 18 inhaled allergens.Results: Positive specific IgE to aeroallergens was detected in 43.44% of our patients. German cockroach (18.9%) was the most frequent sensitizing aeroallergen amongst our asthmatic patients, followed by the fungal allergens (15.57%) and house dust mites (HDMs) (13.93%). Conclusion:German cockroach, fungi, and house dust mite are the chief sensitizing aeroallergens in Egyptian asthmatic patients.

Background Distinguishing asthma from COPD can be difficult especially among old age and smokers. Some patients have common features of asthma and COPD.1 (GINA, 2018). Hence, the definition of asthma COPD overlap (ACO) was developed. ACO is a considerable risk factor for healthcare utilization versus the general population, the asthma population and the COPD population.2(Minchul Kim et al., 2019). Fungal sensitization increase severity of asthma. Aim of the study To compare the prevalence of aspergillus fumigatus sensitization among ACO patients versus asthmatic patients and healthy normal control. Patients and Methods 90 individuals were included; 30 diagnosed as bronchial asthma (According to GINA 2018), 30 ACO patients and 30 healthy normal control. All are group matched to age and sex and selected from the allergy and chest outpatient clinics at Ain shams University hospitals. Total IgE, skin test for Aspergillus and spirometry were done to all participants. Results Aspergillus sensitization was more prevalent among ACO group compared to asthma group however, all control individuals were negative to aspergillus. FEV1 was significantly lower among ACO and asthma groups when compared to control. FEV1 increased significantly in the three groups after albuterol inhalation. Conclusion sensitization to Aspergillus was more among ACO patients compared to Asthma and control groups.