[Methods of silver impregnation in morphological diagnosis of gastric syphilis].

Comparative assessment of methods of silver impregnation for pathohistological identification of Treponema pallidum in gastric syphilis was performed. Levaditi impregnation is preferable in cases of gastrectomy. Silver impregnation in histological slides is performed for studying endoscopic biopsies in view of their small size as well as for retrospective analysis when paraffin blocks only are available.

[Experimental study of the preventive properties of immune milk containing Shigella antibodies].

The protective properties of the mammary gland secretions of cows immunized with Shigella sonnei into the udder were studied. As a model for this study the intranasal and intraperitoneal infection of white mice was used. Immune milk was found to have pronounced protective properties against S.

[Use of the staphylococcal coagglutination reaction to serogroup Escherichiae].

A stable, highly specific antibody diagnostic agent suitable for use in the slide agglutination test was obtained by the adsorption of rabbit OK antisera to different species of the Escherichia genus by staphylococci Cowan I containing protein A in their cell walls. The high effect iveness of the staphylococcal reagent is due to adsorption from rabbit IgG antisera containing specific Escherichia antibodies. The diagnosis of Escherichia infections with the use of staphylococcal antibody diagnostic agent may prove to be considerably cheaper and simpler.