Wall Pellitory
Allergy Facts, Symptoms, and Treatment

A bushy, wind-pollinated, perennial weed, wall pellitory is common in the Mediterranean and along the west coast of Europe. It's also been introduced in other parts of Europe and the Middle East as well as in North and South America and Australia. It prefers to root near surfaces such as rocks, banks, and walls, hence its name.¹ Wall pellitory has two long flowering periods, so while its pollen appears at the beginning of spring, it persists throughout the spring and summer and into fall.² The pollen from this severely allergenic plant causes symptoms of asthma, allergic conjunctivitis, and allergic rhinitis (hay fever).^1,3 Wall pellitory is also known by names such as pellitory-of-the-wall, parietaire, spreading pellitory, asthma weed, and sticky-weed.¹

Are there other allergens I could be sensitized to?*

Many patients with wall pellitory allergy can experience symptoms when exposed to other allergens such as tree, weed, or grass pollens, making it difficult to determine which pollen is causing the symptoms, especially when pollen seasons are overlapping. This is called cross-reactivity and occurs when your body's immune system identifies the proteins, or components, in different substances as being structurally similar or biologically related, thus triggering a response.⁵ Other respiratory allergens that may cause reactions associated with wall pellitory are certain grasses, trees, and weeds (e.g., birch, alder, juniper, ragweed, olive, goosefoot, pigweed).⁶

Knowing the proteins, or components, within each allergen that are triggering your symptoms can help guide your management plan. With that in mind, and based on your symptom history, your healthcare provider may suggest something called a specific IgE component test, which can help reveal other pollens and foods you may react to. Results from this test can also help your healthcare provider decide if allergen immunotherapy may reduce your symptoms.⁵

Already have your specific IgE component test results?

Your component test results will include the name of the components (a series of letters and numbers). Your healthcare provider will likely review the results with you, but here you'll find an at-a-glance breakdown you can use as a reference. Simply match the component names to the list below to see what they mean in terms of symptom management.⁵

rPar j 2 

• Indicates that symptoms may be caused by wall pellitory pollen.⁵
• Wall pellitory pollen immunotherapy may be considered.⁵
• May be associated with PFAS symptoms after ingestion of plant foods, e.g., vegetables, fruits, and nuts. Investigation of food allergy may be considered.⁵

rPhl p 7

• Indicates symptoms may be caused by grass or by other pollen, e.g., from trees and weeds. Further investigation may be considered to confirm all allergy triggers.⁵
• May be associated with more severe symptoms and higher prevalence of asthma than other grass pollen allergies.⁵

rPhl p 12

• Indicates that symptoms may be caused by grass or by other pollen, e.g., from trees and weeds.

MUXF3 (CCD)

• Positive specific IgE for wall pellitory in combination with MUXF3 CCD (Cross-Reactive Carbohydrate Determinant) being the only positive component test indicates that the cause of symptoms may be something other than wall pellitory pollen.⁵

Test results should be interpreted by your healthcare provider in the context of your clinical history. Final diagnosis and decision on further management is made by your healthcare provider.

*These products may not be approved for clinical use in your country. Please work with your healthcare provider to understand availability.