Controlled Birch Pollen Challenge in the Environmental Exposure Unit (EEU); Clinical Validation and Biomarker Exploration

The Environmental Exposure Unit (EEU) is a controlled allergen challenge model of allergic rhinitis ('hayfever') that has been used extensively to study various anti-allergic therapies. The EEU is a unique, internationally recognized research facility that allows for the exposure of groups of as few as 5 to as many as 150 volunteers simultaneously to ambient levels of airborne allergens such as ragweed pollen and provides a unique study environment ideally suited to evaluate efficacy and onset of action of various anti-allergic medications. This specialized facility, located within Kingston General Hospital, allows for the tight regulation of environmental variables such as air quality, temperature, humidity and CO2 levels as well as the precise maintenance of allergen concentration within this specialized room. Thus the EEU provides a closed environment in which participants are exposed to a predetermined, controlled, constant level of airborne pollen. All previous studies have used either ragweed or grass pollen, and the investigators have not clinically validated the use of birch pollen in the EEU. This study will confirm that the birch pollen circulated in the EEU can generate allergic rhinitis symptoms similar to those seen in the 'real world', and will also provide an opportunity to collect blood from participants before and after allergen challenge in order to better understand allergic inflammation, to hopefully someday identify novel therapies in allergic disease.

This study will consist of a Screening Visit and one pollen exposure visit. The duration of each participant's participation in the study from Screening to End of Study (EOS) will be approximately 3 weeks. The study population will consist of healthy, ambulatory male and female volunteers, 18-65 years of age with either a history of seasonal allergic rhinitis or a history of no allergic reactions. Approximately 55-75 participants will be screened to ensure 50 eligible participants are enrolled into the study (40 allergic, 10 non-allergic).

All participants will give written informed consent prior to any study procedures being performed. Participants who meet all inclusion/exclusion criteria during the screening process will be asked to return to the EEU for their pollen exposure visit. At the Screening visit participants will provide a full medical history and undergo a physical examination. They will have their height/weight and vitals measured and skin testing will be performed to confirm allergic response to a panel of common aeroallergens (or lack of response for the non-allergic individuals). Women of child bearing potential will undergo a urine pregnancy test to rule out pregnancy. Eligible participants will be asked to return to the research site for one 4 hour exposure to birch pollen in the Environmental Exposure Unit (EEU). Peripheral blood samples will be collected before and after pollen exposure for measurement of potential biomarkers.