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Skin reactions to mesquite pollen extract occurred in 62% of 100 consecutive patients tested at an adult allergy clinic despite absence of the plant within about a 50-mile radius. Radioallergosorbent test (RAST) studies confirmed that the skin tests represented specific IgE antibodies to the mesquite pollen. Nasal, conjunctival, and bronchial challenges indicated that mesquite provoked symptoms in a specific manner. The pollen was trapped at a considerable distance from its source. Mesquite surveys and climatologic data suggested a route and method of transport. Mesquite pollen is a potent allergen capable of evoking immediate hypersensitivity reactions in a susceptible population remote from the plant source.
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