**Question:** Which of the following is not a feature of ABPA (Aspergillus bronchial allergy pulmonary aspergillosis)

A. Eosinophilia
B. Aspergillus sensitization
C. Chronic productive cough
D. Pulmonary fibrosis

**Core Concept:** Aspergillus bronchial allergy pulmonary aspergillosis (ABPA) is a severe hypersensitivity reaction to Aspergillus fumigatus, a common mold found in the environment. ABPA is characterized by lung inflammation, eosinophilia (increased eosinophils in blood and tissue), and hyperimmunoglobulin E (hyperIgE) levels.

**Why the Correct Answer is Right:** D) Pulmonary fibrosis is not a feature of ABPA because it is a process characterized by scarring and thickening of the lung tissue. In contrast, ABPA primarily involves inflammation and eosinophilia, without significant fibrosis.

**Why Each Wrong Option is Incorrect:**

B. Aspergillus sensitization: ABPA is characterized by specific IgE (hyperIgE) production against Aspergillus fumigatus, which is consistent with the disease process. ABPA is a consequence of Aspergillus sensitization, not a feature that does not belong to it.

A. Eosinophilia: Eosinophilia is a core feature of ABPA, as it is characterized by the activation of eosinophils and their infiltration into the lungs, leading to tissue damage and inflammation.

C. Chronic productive cough: While ABPA can present with a productive cough, chronicity cannot be stated as a feature of ABPA, as the disease is characterized by acute exacerbations and remissions.

**Clinical Pearl:** ABPA is a hypersensitivity disorder that can coexist with asthma or cystic fibrosis, which can exacerbate the condition. Prompt diagnosis and treatment are crucial to prevent lung fibrosis and bronchiectasis.