In the mucosal membrane of the uterine horns in Wistar white rats mainly small and middle lymphocytes (predominantly T-cells) and rather small amount of plasmocytes and macrophages are presented. After intrauterine administration of bacteria and viruses (BCG vaccine, influenza inactivated liquid vaccine of A type) the local immune reaction develops according to the cellular type with maximum at the first week, before the total immune response, with its peak occurring on the 14th day of the experiment.