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Allergen Exposure – Definition, Causes and Treatment

Allergen exposure refers to contact between the body and an allergen capable of triggering an allergic reaction. It is a key factor in the development and progression of allergies.

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Things worth knowing about "Allergen Exposure"

Allergen exposure refers to contact between the body and an allergen capable of triggering an allergic reaction. It is a key factor in the development and progression of allergies.

What Is Allergen Exposure?

Allergen exposure describes the contact between a person and a substance – known as an allergen – that can provoke an exaggerated immune response, or allergic reaction, in sensitised individuals. Exposure can occur through multiple routes: inhalation, skin contact, ingestion, or injection.

Whether allergen exposure actually leads to symptoms depends on several factors: the amount of allergen encountered, the degree of individual sensitisation, the route of exposure, and the overall health status of the person involved.

Common Allergens and Sources of Exposure

Inhalation allergens (aeroallergens): Tree, grass, and weed pollens; house dust mites; pet dander; mould spores
Food allergens: Peanuts, tree nuts, cow milk, eggs, wheat, soy, fish, shellfish
Contact allergens: Nickel, fragrances, latex, preservatives in cosmetics
Insect venom allergens: Bee and wasp venom
Drug allergens: Penicillin and other antibiotics, non-steroidal anti-inflammatory drugs

Causes and Risk Factors

Allergen exposure alone is not sufficient to cause an allergic disease. First, sensitisation must occur: upon repeated contact with an allergen, the immune system produces specific antibodies (IgE). On subsequent exposure, the body then responds with allergic symptoms.

Risk factors for increased sensitisation include:

Genetic predisposition (atopic constitution)
Early-life environmental conditions (hygiene hypothesis)
Air pollution and environmental factors
High ambient allergen concentrations
A weakened immune system or concurrent medical conditions

Symptoms Following Allergen Exposure

The symptoms that follow allergen exposure can vary considerably depending on the individual and the type of allergen involved:

Respiratory tract: Sneezing, runny or blocked nose, asthma, coughing
Eyes: Redness, itching, watering (allergic conjunctivitis)
Skin: Hives (urticaria), eczema, contact dermatitis, swelling
Gastrointestinal tract: Nausea, abdominal pain, diarrhoea, vomiting
Systemic: In severe cases, anaphylactic shock with life-threatening drop in blood pressure

Diagnosis

Diagnosing allergic sensitisation and identifying the relevant allergens involves:

Medical history: Review of symptoms and typical exposure situations
Skin tests: Prick test, intradermal test, or patch test to assess direct reactions
Blood tests: Measurement of allergen-specific IgE antibodies (e.g., RAST, ImmunoCAP)
Provocation tests: Controlled, supervised exposure to the suspected allergen under medical observation

Treatment and Prevention

Allergen Avoidance

The most effective measure is allergen avoidance – consistently minimising contact with the triggering allergen. This is not always fully achievable, for example in the case of pollen or house dust mite allergies.

Pharmacological Treatment

Several medications are available to relieve symptoms:

Antihistamines: Block the effects of histamine and reduce typical allergy symptoms
Corticosteroids: Reduce inflammation, e.g. as nasal sprays or eye drops
Bronchodilators: Open the airways in allergy-induced asthma
Adrenaline auto-injector: Emergency medication for anaphylactic reactions

Allergen Immunotherapy (Desensitisation)

Specific immunotherapy (SIT), also known as desensitisation or hyposensitisation, is the only causal treatment option. Through the controlled, gradual increase in allergen dosage, the immune system is trained to tolerate the allergen, resulting in long-term reduction of symptoms.

References

World Health Organization (WHO) – Allergic Rhinitis and its Impact on Asthma (ARIA) Guidelines, 2022
Muraro A et al. – EAACI Guidelines on Allergen Immunotherapy: Executive Statement. Allergy, 2018; 73(4): 739–743
Holgate ST et al. – Allergy. 4th ed. Saunders Elsevier, 2012

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