Abstract
1. 1. The life cycle of the aphid is explained. The aphid is one of the most prolific insects known. 2. 2. An explanation of the qualifications of the aphid as an air-borne inhalant allergen is offered. 3. 3. A number of patients with seasonal allergic manifestations have symptoms which are not explained by the known seasonal allergens. 4. 4. Seventy-five of 121 patients, whose symptoms were unexplained by known seasonal inhalant allergens, gave positive reactions to aphid extract. 5. 5. One patient had a systemic reaction of marked intensity following a skin test with aphid extract. 6. 6. Passive transfer tests indicate that transferable skin-sensitizing antibody is present in the blood of skin-sensitive individuals and that the antibody is not antigenically related to ragweed. 7. 7. It is felt that the aphid is an important insect inhalant allergen heretofore unnoticed.
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