Abstract
1. 1. Casuarina equisetifolia and Casuarina lepidipholia, commonly known as Australian pine, pollinate in Miami Beach during January, February, March, and April. The height of the pollinating season for the past two years has been in April. 2. 2. The pollen of Casuarina is abundant, wind borne, and capable of producing hay fever or asthma in allergic persons. 3. 3. Three patients studied had hay fever, asthma, or both in the North but not during their first two winters in Miami Beach. In the subsequent winters in Miami Beach, all three patients had hay fever or asthma at intervals during January, February, March, and April. 4. 4. From a study of atmospheric slides during the past two years, it was found that symptoms appeared and disappeared concurrently with the presence or absence of the Casuarina pollen in the air. 5. 5. Positive scratch tests and positive intracutaneous tests were obtained on all three patients. Specific reagins were demonstrated in two of the patients. A nasal test with dry pollen done out of season on one patient was positive.
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