Effects of Diesel Exhaust Followed by Administration of Nasal Spray Flu Vaccine on Individuals With & Without Allergies

Allergic rhinitis (AR) is a condition that exists when an individual with a specific allergy reacts to that allergen resulting in a runny and/or stuffy nose, postnasal drip, and possible symptoms of sneezing, scratchy throat, itchy nose, ears or throat. When the allergic person is exposed to such an allergen, the body reacts with overproduction of certain chemicals which cause inflammation and subsequent symptoms of AR. These responses are related to the body\'s hyperreactive response to exposure to an otherwise harmless substance such as dust, ragweed, pollen, cat dander etc. There are data to suggest that air pollution resulting from diesel exhaust can increase the body\'s response to airway inflammation caused by virus. The purpose of this research study is to determine if individuals with AR have increased inflammatory responses to flu virus following exposure to diesel exhaust (DE) vs exposure to clean air compared to how individuals who do not have allergies respond to the same exposure conditions. The hypothesis for this study is that diesel exhaust exacerbates LAIV-induced allergic nasal inflammation, using controlled exposures in AR volunteers compared to non-allergic individuals