Hyposensitization in ragweed pollinosis.

The efficacy of hyposensitization in the control of ragweed hay fever has been demonstrated in both the clinic and the laboratory. In this paper evidence is presented that it also is important in preventing ragweed asthma. This is based on an experience with seven untreated patients who developed severe asthma in the 1975 season. The results of a 15-year study of constitutional reactions resulting from hyposensitization is summarized and means of their prevention is discussed.