Abstract
Salmonella typhi (strain Ty2—4446) cultivatedin vitro within the macrophage of mice immunised twice specifically with a high dose of killed vaccine, multiplied less intensively than in the cells of non-immunised control animals during 24 hours cultivation. In addition, a certain suppression of growth ofSalmonella enteritidis andSalmonella suis var. Kunzendorf was observed in the macrophages of mice immunised withSalmonella typhi vaccine. Double immunisation of mice with high doses of killed vaccine fromSalmonella enteritidis andSalmonella suis led to the mice macrophages being able to suppress multiplication of both homologous microbes andSalmonella typhi. The formation of such cross resistance in mice immunised with salmonella vaccines excludes the possible participation of O, H, and Vi antibodies in this phenomenon.
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