Experimental researches were conducted on reactogenicity and immunological efficiency of pair associations of 8 commercial drug preparations. The following vaccines were used in various pair combinations: typhoid, plague, smallpox, typhus, tick-borne encephalitis, yellow-fever, cholera, sextaanatoxine. Pair combinations of these drug preparations were proved to be harmless. Their reactogenicity was manifested mainly in more or less pronounced vaccination reaction which may be considered as tolerable. Immunological efficiency practically of all pair combinations of vaccines, which was determined by the frequency and intensity of antibody formation, had the same indexes as the control one. The immunity expression of a large majority of pair combinations of vaccines also was unchanged. The study in vitro of compatibility of pair associations of vaccines proves the low stability of yellow-fever vaccine, which falls down under the influence of plague and cholera vaccines, or sextaanatoxine. On the contrary, smallpox vaccine makes yellow-fever vaccine more active. Plague vaccine is stimulated by smallpox vaccine and is oppressed with combined application of typhoid vaccine and sextaanatoxine.
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