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Aim. To study the subpopulational structure of blood cells of the experimental animals immunized with thermoextracts (TE) of Brucella abortus in L- and S-form. Materials and methods. Total 100 certified («Vector», Novosibirsk) outbred mice were immunized with B. abortus I-206 TE in L- and S-form in 20 μg protein dose. After 1, 3, 7, 14 and 21 days of observation the phenotypes (CD45, CD3, CD4, CD8, CD19, CD69) of blood cells were detected. Results. General regularities were revealed after injection of the experimental preparations. So, B. abortus TE in L- and S-form caused the immune response that increased granulocyte number and expression of early activation marker CD69 by T- and B-lymphocytes of blood in early period of observation (1-3 days), decrease in general B-lymphocyte content in late periods of observation (7-21 days). Thus, mice received B. abortus ТE in L-form demonstrated authentically higher CD69 expression of blood lymphocyte subpopulations than mice received B. abortus ТE in S-form. Distinctions in formation of humoral immune response were revealed that probably was connected with alteration of Brucella chemical composition in the course of L-transformation. Conclusion. The investigation established that B. abortus TE in L- or S-form caused immunological reorganization in the experimental animal organisms. On the basis of the fin

Background. Brucellosis is an acute infectious-allergic zoonotic disease in which sick farm animals are the main source of infection for humans. Immunization of animals and people on the territory of Russia is carried out by live vaccines, which, having a high immunogenicity, can cause clinical, hematological and immune changes. Therefore, the work on the design of new vaccines that provide high protection and do not possess reactogenicity, agglutinogenic and sensitizing activity is the current direction of the study. Methodology. The study was performed on 72 outbred white mice immunized with inactivated B. abortus 19 ВA vaccine and thermal extracts (TE) of B. abortus I-206 in L- and S-form. Morphofunctional changes in the regional lymph node, spleen, and thymus of experimental animals were examined on days 3, 7, 14, and 21 of the time of immunization. Results.The influence of single introductions thermoextracts B. abortus I-206 in L-and S-form in comparison with inactivated vaccine B. abortus 19 ВА. the removal or the morphohistologic indices of immune organs of experimental animals. Found that thermoextracts have the ability to activate immune adjustment within the structures of the spleen and lymph nodes, without causing side effects, including allergic reactions. Conclusions. Preparations obtained from B. abortus in the L- and S-forms have the ability to activate immunological rearrangement in immunocompetent organs without causing any side effects. The results indicate the promise of further research in this direction.

Live vaccines are used for specific brucellosis prophylaxis in the Russian Federation. These vaccines in addition to a number of positive properties have some limitations including high agglutinogenicity, reactogenicity, sensitizing activity. In this connection, the development of subunit vaccines without adverse reactions is a perspective direction in modern vaccinology. Complex morphological research of the adrenal glands and comparative analysis of peripheral blood (leukogram, leukocytic index and index of allergization) of white mice immunized with thermoextracts (ТE) of Brucella abortus I-206 in L- and S-form and inactivated vaccine B. abortus 19 ВА were conducted. It was shown that ТE unlike B. abortus 19 ВА caused minor alterations in peripheral blood of the experimental animals in early periods of observation (increase of allergization index, changes in leukogram) with the subsequent levelling to the values in control. Expositions of the adrenal gland zoning were determined and cellular structure was estimated in consideration of morphometry. Changes in architectonics of the mice organ immunized with B. abortus 19 ВА were revealed. These alterations could indicate the stress-reaction development. In case of ТE application the given changes were insignificant and were developed in early periods. The revealed morphological changes in adrenal glands of laboratory animals permit to prove the necessity of realization the further experimental researches to ТE application as the components for development of a subcellular brucellosis vaccine.

Objective of the study is to prepare rabbit monospecific anti-abortus serum to a Brucella S-form thermoextract, as well as to evaluate its activity and specificity. Materials and methods. Utilized was polyvalent hyperimmune serum obtained to Brucella thermoextract. It was adsorbed by a strain of heterologous species Brucella melitensis 16 N. Reference, vaccinal and field Brucella strains were used to estimate the activity and specificity of the serum produced. Results and conclusions. This serum possesses high activity (1:160, 1:320 titer) and specificity, and the results completely coincide with the data specified in the table of differential properties presented in МR 3.1.7.1189-03 “Prophylaxis and laboratory diagnostics of human brucellosis». The outlined method for manufacturing monospecific Brucella anti-abortus serum permits for a considerable decrease in biological hazard for personnel involved in the technological operations.

It is known that S-form Brucella causes allergic transformation in a macroorganism, which is manifested as delayed-type hypersensitivity reaction. This capacity in atypical variants (L-forms) is under-investigated. It is demonstrated that corpuscular antigen in B. abortus 19BA vaccine and thermoextract prepared from B. abortus I-206 in S-form when threefold administered cause marked sensibilization; while corpuscular antigen and thermoextract produced from Brucella in L-form, and thermoextract from Brucella in S-form in case of one time administration do not have such an effect on leucocytes of white mice.