🫁 Understanding ABPA: When and Why It Appears, and Who’s at Risk

Allergic Bronchopulmonary Aspergillosis (ABPA) is a chronic allergic lung condition that’s often misunderstood or misdiagnosed — especially when it appears for the first time in adulthood. This article answers key questions:

• Why does ABPA usually develop later in life?

• Can it be diagnosed earlier?

• What about severe asthma in children — is that an exception?

• Are there groups at special risk, like those with cystic fibrosis?

This guide is designed for patients, carers, and anyone living with or at risk of ABPA.

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🔹 1. What Is ABPA?

ABPA is a hypersensitivity reaction (not a fungal infection) to the fungus Aspergillus fumigatus, which is found in the air we breathe.

In people with asthma, cystic fibrosis (CF), or structurally damaged lungs, Aspergillus can settle in the airways and trigger a strong allergic immune response, causing:

• Swollen and inflamed airways

• Mucus build-up that’s hard to clear

• Worsening of asthma or coughing

• Irreversible lung damage (e.g. bronchiectasis) if untreated

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🔎 2. Why Is ABPA Usually Diagnosed in Adulthood?

Despite being linked to asthma — often a childhood condition — most cases of ABPA are diagnosed in adulthood, typically between ages 20 and 50.

Why? Because ABPA is only diagnosed when several things happen at the same time:

• High total IgE levels

• Positive Aspergillus-specific IgE or IgG

• Lung symptoms like wheezing, cough, mucus

• CT evidence of mucus plugging or early bronchiectasis

A person might be allergic to Aspergillus (sensitised) for years without having ABPA. Only when their immune system crosses a certain threshold — sometimes after a viral illness, fungal exposure, or change in immune function — does full ABPA emerge.

This helps explain why many people are diagnosed for the first time in their 30s or later, even with a history of asthma.

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🧒 3. Is ABPA Ever Diagnosed in Childhood?

✅ Yes — but it’s rare.

There are a few specific exceptions:

🔸 A. Cystic Fibrosis (CF)

• ABPA is much more common in people with CF — including older children and teenagers.

• CF causes thick mucus and impaired airway clearance, which promotes persistent exposure to Aspergillus.

• That’s why CF care guidelines include annual ABPA screening from a young age.

🔸 B. Severe asthma in childhood

• Children with very severe or poorly controlled asthma may have:

  • High IgE

  • Mucus build-up

  • Sensitisation to Aspergillus

• These children may develop fungal allergic airway disease or be labelled as having SAFS (Severe Asthma with Fungal Sensitisation).

• Full ABPA may still not be diagnosed until later adolescence or adulthood — but these cases may represent a kind of “pre-ABPA.”

🔸 C. Rare immune disorders

• Conditions like hyper-IgE syndrome (HIES) or chronic granulomatous disease may cause early ABPA-like features.

• These are rare and usually managed by immunology specialists.

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⚖️ 4. What’s the Difference Between ABPA, SAFS, and Sensitisation?

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🧪 5. Could a Screening Test Detect ABPA Earlier?

Not currently — but research is ongoing.

Today, ABPA is diagnosed based on a set of criteria (IgE levels, imaging, symptoms), not a single test. That means:

• Early warning signs may be present for years

• But ABPA is only diagnosed once enough features appear together

A future screening test for “pre-ABPA” could:

• Identify at-risk individuals earlier

• Allow close monitoring

• Help start treatment at the first signs of disease

This wouldn’t “prevent” ABPA in every case, but could reduce its severity and protect lung function.

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💡 6. Can ABPA Be Prevented?

We can’t fully prevent ABPA — but we can reduce risk and prevent long-term damage:

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📘 7. Summary: Key Takeaways

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🗣️ Patient Tip

“If you’ve just been diagnosed in your 30s, 40s or later — that doesn’t mean it was missed. It means it’s finally been recognised, and now you can get the right treatment.”

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