 1. Group 1: subjects with physician-diagnosed allergic rhinitis. Allergic rhinitis is defined by clinical symptoms of sneezing, runny nose, nasal congestion and evidence of IgE-mediated disease allergy skin prick test positive or radioallergosorbent test RAST positive to environmental inhalants such as trees, grasses, weeds, animal dander, molds, dust mite, cockroach. 