| Abstrakt: |
A model of delayed hypersensitivity to Streptococcus hemolyticus, group A, were obtained in guinea pigs and rabbits. Studies of spontaneous changes of the immuno-allergic reactivity revealed that after a month of sensitization there developed delayed hypersensitivity only; according to the results of late skin tests it lasted not less than 6 months (the duration of investigation). The delayed hypersensitivity component began to manifest itself in 2 1/2 to 3 months and increased later on. Specific hyposensitization was performed with streptococcus allergens differing by physico-chemical conditions, i.e. the corpuscula allergen, the one that was lysed by ultrasonic waves, and Ando-Verzhikovsky's allergen. The latter had the most intensive hyposensitizing features. Specific hyposensitization was more demonstrative after the intracutaneous long-term course injections of threshold doses. Administration of subthreshold doses, as well as subcutaneous or intravenous injections of the allergen, was ineffective. |
