Most people – including many doctors – associate Allergic Bronchopulmonary Aspergillosis (ABPA) almost exclusively with asthma or cystic fibrosis. In fact, the current diagnostic criteria for ABPA often assume the presence of asthma as a prerequisite. But what happens when a patient has all the features of ABPA… without ever having had asthma?
This article explores the possibility – and growing recognition – of ABPA without asthma.
🔍 What Is ABPA?
ABPA is an allergic (hypersensitivity) reaction to the fungus Aspergillus fumigatus, which can colonise the lungs and cause:
-
Severe allergic inflammation
-
Damage to lung tissue (bronchiectasis)
-
High levels of IgE (often >1000 IU/mL)
-
Positive skin tests or blood tests for Aspergillus
Traditionally, ABPA is diagnosed in people with asthma or cystic fibrosis, where the airways are already vulnerable.
❗But Can ABPA Occur Without Asthma?
Yes. Though uncommon, there are confirmed cases where ABPA occurs in people who:
-
Do not have asthma
-
Have no wheeze, breathlessness or variability in symptoms
-
Show no reversibility on a bronchodilator test
-
May not respond to inhaled corticosteroids
This presentation is now increasingly recognised – particularly:
-
After viral infections like COVID-19
-
In people exposed to environmental moulds
-
In those with no personal or family history of asthma
🧪 Diagnostic Clues
Patients with ABPA but no asthma typically still show:
-
Very high total IgE levels
-
Positive Aspergillus-specific IgE and IgG
-
Radiological changes like central bronchiectasis
-
Sometimes eosinophilia in blood
But they do not show:
-
Classic asthma symptoms (e.g. wheeze, reversible breathlessness)
-
Improvement with bronchodilators
-
Variable peak flow readings
🧬 How Might This Happen?
There are a few theories:
-
Some people have a strong allergic immune response (IgE-driven) to Aspergillus alone, even without underlying asthma
-
COVID-19 and other infections may prime the immune system or damage airways enough to allow fungal colonisation
-
Not all bronchial hypersensitivity is asthma — the airway inflammation in ABPA is unique and not always “asthmatic” in pattern
✅ What Tests Can Help Confirm or Rule Out Asthma?
For patients who have ABPA but no clear asthma symptoms:
-
Bronchodilator reversibility test → May be negative
-
Methacholine or histamine challenge test → Gold standard for confirming asthma
-
FeNO test → Measures eosinophilic airway inflammation (may be high in both ABPA and asthma)
-
Peak flow monitoring → Often stable in ABPA without asthma
These tests can help clarify the diagnosis and prevent mislabeling patients as asthmatic when they are not.
🧭 Why Does It Matter?
Correct diagnosis matters because:
-
Not all ABPA patients benefit from inhaled corticosteroids or asthma drugs
-
Treatment should be tailored — e.g. antifungals and oral steroids for ABPA, but not unnecessary asthma medications
-
Misdiagnosis may delay the right treatment and overburden patients
🩺 A Call to Clinicians
If a patient has high IgE, bronchiectasis, and strong Aspergillus sensitisation — but no clinical asthma — consider ABPA without asthma.
Request confirmatory tests before labeling someone asthmatic for life. In these rare cases, asthma criteria do not fully apply — but the patient still needs support for ABPA.
🧾 Summary
| Feature | ABPA With Asthma | ABPA Without Asthma |
|---|---|---|
| Wheeze/breathlessness | Common | May be absent |
| Bronchodilator response | Often positive | Usually negative |
| Total IgE | High | High |
| Aspergillus IgE/IgG | Positive | Positive |
| Imaging (HRCT) | Bronchiectasis | Bronchiectasis |
🙋 What Can Patients Do?
If you’ve been diagnosed with ABPA but don’t believe you have asthma:
-
Ask your doctor about further testing to confirm or rule out asthma
-
Keep a record of your symptoms, peak flow (if used), and medication response
-
Discuss your IgE levels, CT scan results, and whether other diagnoses (e.g. chronic pulmonary aspergillosis) might apply
Latest News posts
News archive