[The antilysozyme activity of the meningococci isolated from bacterial carriers in closed collectives with different epidemiological situations].

The degree of the antilysozyme activity (ALA) of 430 Neisseria meningitidis strains isolated from 379 healthy carriers in 11 closed groups with different epidemiological situation and in 3 family foci was studied by the method of delayed antagonism. 87% of the strains exhibited ALA in a concentration of lysozyme between 1 and 10 micrograms per ml of the medium; about 11% of them were highly active, inactivating 20 and 25 micrograms of lysozyme per ml. ALA was shown to be the constant sign of carriership.

[Role of peritoneal macrophages in the development of an experimental Salmonella infection].

The effect produced on the course of Salmonella infection in mice by the removal of peritoneal macrophages with agarose has been studied. Peritoneal macrophages have been shown to control the multiplication of faintly virulent and virulent S. typhimurium strains in the spleen of mice.