[Hemagglutinating activity of enterotoxic strains of E. coli isolated from calves].

The manose-resistant hemagglutination activity of 272 E. coli strains isolated from calves sick or dead of colibacteriosis, 43 of which were enteropathogenic, was assessed. Strain enteropathogeneity was determined after the method of Smith and Halls (1967).

[Experiments to establish the most suitable method for the production and control of conjugated sera].

Studies aiming to establish the most suitable method for conjugated serum production and control were carried out. Results obtained indicate that purest globulin fractions are obtained in case the serum is precipitated by 50% saturation with (NH4)2.SO4, then the sediment is washed with 50% (NH4)2SO4, dissolved in water and precipitated again by 50% saturation with (NH4)2SO4.

[Sporulation of anthrax bacilli].

Studies on Bac. antharcis sporulation were carried out. By modifying the medium of Kim et al.

[Production of trivalent vaccine against avian spirochetosis].

Reshetnyak's method was employed to produce a trivalent vaccine against avian spirochetosis, using the serotypes Surnevo I, Pamoukchii, and Venets established in this country. The vaccine was tested for sterility, innocuity, and immunogenicity. Its activity was determined via biologic titration on birds.

[Inactivated saponin vaccine against salmonellal abortion in sheep].

An inactivated saponine vaccine is prepared from five highly immunogenic Salmonella abortus ovis strains, selected by means of a biological test on white rats. Saline was used as a diluent of the vaccine, with the addition of 30 per cent glycerine, 0.012 per cent saponine and 0.