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An estimated 50 million Americans have allergies to airborne triggers that cause symptoms of hay fever. Another 17 million Americans have symptoms of asthma. Airborne allergies occur when exposure to a particular antigen (such as pollen, mold spores or animal dander) triggers the immune system to produce antibodies that trigger the release of histamine and other inflammatory compounds from mast cells. The bark of a rubber tree known as Funtumia elastica growing in west Africa provides a wonderful, natural remedy for many common respiratory complaints.