 - A demonstrated sensitivity to at least one allergen known to induce PAR house dust mite, animal dander, cockroach, and molds based on a documented result with a standard skin-prick test either within 90 days prior to screening or performed at the Screening visit. A positive test is defined as a wheal diameter at least 3 mm larger than the negative control wheal for the skin prick test. The subjects positive allergen test must be consistent with the medical history of PAR and must be present in the subjects environment throughout the study. 