[Systemic immunological memory in enteral immunization with the O antigen from S. sonnei].

Mice received S. sonnei O-antigen at various concentrations (0.01-20,000 micrograms/ml) in drinking water.

[Quantitative analysis of immunoglobulins using the hemagglutination-inhibition test. II. Comparison with the results of radial immunodiffusion].

Stable erythrocytic diagnostic reagents have been prepared on the basis of formalinized erythrocytes coated with purified IgG, IgM, IgA ans sIgA with the aim of the quantitative determination of immunoglobulins in the hemaglutination inhibition (HAI) test. The sensitivity of the HAI test in the quantitative determination of immunoglobulins is 50--100 times higher, but its accuracy is lower than those of radial immunodiffusion (RID). This is the cause of a high variability in indices of serum immunoglobulin levels in healthy persons.

[Quantitative determination of immunoglobulins in the hemagglutination inhibition reaction. I. A method of expressing the results based on a comparison with a standard and using a logarithmic scale].

The sources of errors in the quantitative determination of immunoglobulins in the passive hemagglutination inhibition test are considered. The influence of some factors (the quality of erythrocyte diagnostic reagents, the non-standard working dose of the antiserum) can be reduced if in each test the material under study is compared with a known preparation having known serological activity (standard preparation). A suggestion is made on the advisability of expressing the results of the test in the logarithmic (log2) scale of serological activity units (SAU), where the activity of 100 IU/ml is considered to be 10 units.

[Ribosomal dysentery vaccine. III. An immunochemical and serological study].

Sh. sonnei rib oscmes, isolated by differential centrifugation, were previously shown to be highly protect ive against experimental keratoconjunctivitis in guinea pigs. Immunochemical study showed that ribosomal preparations were not uniform in their antigenic composition: as a result of immunoelectrophoretic analysis with the use of anti-ribosomal hyperimmune rabbit antisera, these preparations were found to contain up to 4 antigenic components with different migration rate.

[Ribosomal dysentery vaccine. II. Biological trials of active protection for guinea pigs and mice].

Ribosomal vaccine from Sh. sonnei injected subcutaneously once or twice in physiological saline or in Freund's complete adjuvant produces a marked protective effect against experimental keratoconjunctivitis in guinea pigs. Inhibition of the protective effect by high doses (above 100 microgram) of ribosomal vaccine is evident after a single, but not repeated injections.

[Ribosomal dysentery vaccine. I. Method of production, physical and chemical properties].

Studies of A. and G. Youmans on the experimental tuberculosis led to discovery of a fundamentally new type of vaccines (ribosomal vaccines) which proved to be highly effective in the prophylaxis of many experimental infections.

[Specific antibodies bound to secretory IgA in the sera of patients with intestinal infections].

Specific IgA and sIgA antibodies were studied in the sera of patients suffering from various intestinal diseases (dysentery, salmonellosis, typhoid fever, chronic typhoid carrier state) and in the sera of healthy persons immunized by parenteral route with typhoid alcohol vaccine. The nature of antibodies was identified in Coombs' test, using monospecific antisera to alpha-chain and to the secretory component. IgA and sIgA antibodies were revealed most frequently in the sera of dysentery patients and of chronic typhoid carriers.

[Isolation of flagellin antigens of salmonellae by the method of ultracentrifugation and their use for preparation of erythrocytic H-diagnostic agents].

Flagellar preparations were obtained from 6 salmonellae strains by differential ultracentrifugation; they were characterized by morphological, immunochemical, and serological tests. The results of investigations showed that the preparations possessed high serological activity; somatic antigen admixture was insignificant. Flagellins extracted from the flagellae were used to prepare erythrocytic H-diagnostic agents.

[Specific immune response and immunoglobulin production in intestinal infections. III. Intestinal antibodies and immunoglobulins in the dynamics of dysentery infection].

Coproimmunoglobulins and specific coproantibodies were studied in 98 adult patients and 32 children in the course of infection caused by Sh. sonnei, and in 102 healthy individuals of various age. The concentrations of IgA, and, to a lesser extent, of the IgG and IgM proved to be significantly higher in the patients than in the healthy persons.