Repeat Nasal Allergen Challenge

Assessment of Inflammatory Mediator and Cellular Changes Following Repeated Nasal Allergen Challenge in Subjects With Allergic Rhinitis Sensitive to Timothy Grass Pollen - a Validation Study

This is a non-drug, biomarker study to assess the utility of the model of repeated nasal allergen challenges in subjects with atopic rhinitis as a method of inducing an increased response to inhaled allergen, which will more closely resemble the responses seen during the hayfever season.

This is a non-drug, biomarker study to assess the utility of the model of repeated nasal allergen challenges in subjects with atopic rhinitis as a method of inducing an increased response to inhaled allergen, which will more closely resemble the responses seen during the hayfever season.

Inclusion Criteria:

1. Male and female subjects with a history of seasonal (intermittent) atopic rhinitis, aged 18-40 years.
2. Otherwise healthy with no health problems that may jeopardize the subjects participating in the study, absence of history of other significant allergies.

Exclusion Criteria:

1. Smokers (use of tobacco products in the previous 3 months).
2. Presence of any respiratory disease other than a history of mild stable asthma not requiring treatment and associated with normal lung function (FEV1 > 80% predicted at screening).