[Comparative study of the safety, reactogenicity and antigenic activity of chemical and live brucellosis vaccines in a controlled epidemiological trial].

The complex evaluation of the reactogenicity characteristics revealed that after immunization with chemical brucellosis vaccine systemic reactions observed in most of the vaccinees were mildly pronounced and local reactions, mildly and moderately pronounced, their duration not exceeding 48-72 hours. During 4 months after immunization the antigenic and immunogenic potency of chemical brucellosis vaccine was no different from that of live brucellosis vaccine; seropositive persons immunized with chemical and live brucellosis vaccines showed no statistically significant differences in the geometric mean of their antibody titers, as determined in a number of serological tests, for a year after immunization. The examination of the vaccinees 4 and 12 months after immunization revealed that the sensitizing activity of chemical brucellosis vaccine was, respectively, 12.

[Determination of the optimal dose of a cultured inactivated vaccine for preventing Japanese encephalitis].

The article presents the summarized results of the controlled field trial of a new inactivated liquid absorbed tissue-culture vaccine developed in the USSR. The optimal immunization dose has been determined: 1.5 ml of the vaccine introduced with a syringe or a jet injector.

[Methodological principles of the determination of the information value of laboratory evaluation of the immunogenicity and reactivity of vaccines].

The correlation between the reactogenicity and immunogenicity characteristics of different smallpox vaccines, determined under the conditions of a strictly controlled field trial, has been studied by a number of laboratory tests. The most informative and reproducible laboratory methods for evaluating the provisory antigenic and immunogenic potency of smallpox vaccines are the evaluation of the character of lesions developing in rabbits as a result of the intradermal injection of the virus and the determination of the capacity of the virus for multiplication in the skin of a rabbit (reproduction). The most informative and reproducible method for evaluating the provisory reactogenicity of smallpox vaccines for humans is the determination of the capacity of the virus for multiplication at elevated temperature.

[Determination of the optimal inoculation dose of Brucella chemical vaccine].

Brucellosis chemical vaccine, when injected intramuscularly, proved to be low-reactogenic, postvaccinal reactions, both systemic and local, becoming less frequent and intense with the decrease of the dose from 2 to 0.5 mg. The highest antigenic and immunogenic activity was observed with a dose of 1 mg; out of 4 tested doses this dose produced the highest percentage of seroconversions, the highest titers of agglutinins and the longest time of their persistence in the subjects.