Allergic rhinitis allergic rhinitis also have asthma, allergic conjunctivitis, or atopic dermatitis. Allergic rhinitis is typically triggered by environmental allergens such as pollen, pet hair, dust, or mold. Inherited genetics and environmental exposures contribute to the development of allergies. Growing up on a farm and having multiple siblings decreases the risk. The underlying mechanism involves IgE antibodies attaching to the allergen and causing the release of inflammatory chemicals such as histamine from mast cells. Diagnosis is usually based on a medical history in combination with a skin prick test or blood tests for allergen-specific IgE antibodies. These tests, however, are sometimes falsely
Juniperus virginiana female), 'Goldspire' (narrow conical with yellow foliage), and 'Kobold' (dwarf). Some cultivars previously listed under this species, notably 'Skyrocket', are actually cultivars of "J. scopulorum". In the Missouri, Oklahoma and Arkansas Ozarks, eastern juniper is commonly used as a Christmas tree. The pollen is a known allergen, although not as potent as that of the related "Juniperus ashei" (Ashe juniper), which sheds pollen a month earlier. People allergic to one are usually allergic to both. "J. virginiana" sheds pollen as early as late winter and through early spring. Consequently, what begins as an allergy to Ashe juniper in the winter