Can a pinpoint pollen dose unmask allergy triggers?
NCT ID NCT05346718
First seen Jul 24, 2026 · Last updated Jul 24, 2026
Summary
This study aims to find the lowest concentrations of ragweed and birch pollen that cause allergy symptoms in people with seasonal allergic rhinitis. Participants sit in a special chamber where pollen levels are carefully controlled, and their nasal symptoms are measured. The goal is to understand how potent ragweed pollen is compared to birch pollen.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
- Active substance
- ragweed pollen, birch pollen, and clean air (placebo) exposure in an allergen challenge chamber
- What this could lead to
- If successful, this could help set evidence-based pollen warning thresholds and improve allergy management for ragweed and birch.
- What could go wrong
- This is a small, early-phase study with only 18 participants, so results may not apply broadly. Allergic reactions during exposure are a risk.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Get updates
Get notified about this study
Sign up to get updates when this study changes or when new studies for ALLERGIC RHINITIS are added.
By submitting, you agree to our Terms of use
Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Show contact details
Enter your email to view the contact information for this study.
By submitting, you agree to our Terms of use
Locations
-
Fraunhofer Institute for Toxicology and Experimental Medicine
Hanover, Lower Saxony, 30625, Germany
More trials for these conditions
Other studies related to the condition(s) this trial covers.
- Can an antihistamine–steroid combo pill beat standard allergy meds?
- Allergy tablets under the tongue may cut hay fever drug use for years, massive real-world study suggests
- New allergy pill could offer relief from sneezing and stuffy nose
- Allergy study seeks to pinpoint those most bothered by cats and birch pollen
- New injection could tame seasonal allergy symptoms for those failed by standard treatments
- Dog allergy vaccine shows promise in small swedish trial