The Results of the Specific Treatment of Late Hay Fever

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Abstract
Hay fever in New England occurs in at least three groups. The first depends upon a hypersensitiveness to the pollen of trees which causes symptoms in May and early June. The second depends upon a hypersensitiveness to the grasses. Here the symptoms begin late in May or early in June and last through the month of June and into July. In both groups the causes of trouble are multiple since the patient is rarely, if ever, hypersensitive to the pollen of a single tree or of a single grass or even to any simple combination of a few different pollens: Usually skin tests reveal positive reactions to a wide variety of different pollens. For example, in this second group, it is unusual to find a hypersensitiveness to timothy alone. Red top, orchard grass, Bermuda grass, Johnson grass, rye grass, and other grasses, will frequently produce skin reactions at the same time and often of approximately the same intensity.

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