Food Allergy Suspected
Conditions
Keywords
food allergy, component resolved diagnosis, skin prick test, oral food challenge, legume allergy
Brief summary
The study is aimed at improving the diagnosis of food allergy, specifically allergy to commonly consumed legumes such as peas, lentils, chickpeas or green beans. Patients suspected of allergy to these legumes will be examined using traditional methods of IgE-mediated allergy diagnosing (skin prick test, testing for specific IgE antibodies against food extract), but also by testing for specific IgE antibodies against relevant allergenic molecules of these legumes. The results of performed tests will be compared with the result of the oral food challenge, which is considered to be the gold standard of food allergy diagnosis.
Detailed description
Legumes are one of the major food allergens, but these are usually peanuts or soybeans. Other legumes, such as peas, lentils, chickpeas or green beans, have been overlooked, but some studies suggest that they may also cause allergic reactions ranging from urticaria to anaphylaxis. The prevalence of allergy to these neglected legumes can range widely (0.5-39.6%) depending on the patient group and the method of allergy diagnosis. The main allergens of legumes are the seed storage proteins, including 7S and 11S globulins and especially 2S albumins, which can cause the most severe, often systemic allergic reactions. These proteins are characterized by their considerable resistance to heat and other physical or chemical influences. Other important legume allergens in our geographical area are the PR-10 proteins cross-reacting with the major allergen of birch pollen (Bet v 1), which in turn are more sensitive to heat treatment and tend to be the source of milder, more local reactions. In contrast, sensitization to other allergen groups, such as lipid transfer proteins (LTPs), oleosins or profilins, is less significant.
Interventions
None listed
Sponsors
University Hospital Pilsen
MacroArray Diagnostics GmbH
Study design
Observational model
COHORT
Time perspective
CROSS_SECTIONAL
Eligibility
Sex/Gender
ALL
Age
4 Months to 65 Years
Healthy volunteers
Yes
Inclusion criteria
* age: ≤ 65 years * signing informed consent to the study * a positive history of an immediate allergic reaction to one or more of the legumes studied (peas, lentils, chickpeas, beans) with skin, gastrointestinal, respiratory or cardiovascular symptoms occurring within 2 hours after ingestion and a positive result of specific IgE testing against ALEX and/or skin prick test with the legume * patients with a positive OFC with any of the legumes studied
Exclusion criteria
* disagreement with the implementation of the oral food challenge * history of severe systemic allergic reaction to the legume in question (Ring-Messmer grade ≥ 3)
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Specificity and sensitivity of the tests performed | 6 months | Specificity and sensitivity of the tests performed |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Food challenge protocol | From enrollment and no later than one. | Food challenge protocol |
| Specific lultiplex assay including allergenic component of legumes | 6 months | Specific multiplex assay including legume allergenic components |
Countries
Czechia
Contacts
CONTACTMartin Liska, MD
PRINCIPAL_INVESTIGATORMartin Liska, MD
Department of allergology and immunology
Outcome results
None listed