Allergen:
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Pellitory of the wall |
Family name:
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Nettle family |
Scientific name:
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Parietaria judaica L. |
Family name latin:
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Urticaceae |
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| Description: |
A 5 - 30 cm tall, fairly decumbent, multi-branched, perennial plant with alternate, small, egg-shaped to roundish leaves; flowers in inconspicuous seed balls; anemogamous ; flowering season V - X;
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| Occurence: |
Rare, introduced from the Meditarranian area and naturalized in wine-growing regions; in wall cracks and near roadsides;
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| Related species: |
Parietaria officinalis L., parietaria; occasionally near stone walls, fences and on rubble; introduced from Southern Europe and naturalized in the Rhine valley and its sidevalleys (VI -I X);
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| Allergy trigger: |
Pollen, 12 - 17 µm;
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| Invasions path: |
Inhalative (May - October);
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| Synonyms: |
Parietaria ramiflora Moench, Parietaria diffusa Mert. & Koch, Parietaria punctata Willd.;
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| Allergology: |
Almost without allergenic relevance in Germany; in Mediterranean countries, however, parietaria pollen are one of the most frequent pollinosis triggers; the fact that the symptoms persist all the way into the winter and a hyper-sensitization only leads to modest success inspite of great difficulties speaks for a high sensitizing potency. There is a high homology between the allergens from parietaria officinalis and parietaria judaica. Stinging nettles, mulberry trees and, on account of their genetic relationship, possibly elm trees are considered to be part of the same antigen community. Genetic studies point towards a high affinity of the primary allergen to HLA-DR 5 for p. officinalis. The leaves and stems have a certain allergenic potency. The parietaria pollinosis is especially important for allergy sufferers staying near the Mediterranean, as they are considerably more exposed to them in that area.
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| Immunology: |
Primary allergen: Par j I, MW 10 000 - 13 000;
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| Clinical relevance: |
light
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| Cross reactivities: |
Occurrence frequently- Parietaria
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