The experiments were designed to examine the effect of Ascaris suum body fluid in the experimental erysipeloid in mice. The experiments were conducted in 3 series depending on the time of the first dosis of Ascaris fluid in relation to the time of infection with Erysipelothrix rhussiopathiae. In no case could death be prevented in mice infected with erysipeloid, though in vitro experiments showed the bacteria to be sensitive to the effect of the fluid (Przyjałkowski, 1962). The only positive effect consisted in the attenuated course of the disease, this being expressed by the increased survival rate of animals which were given the Ascaris body fluid.
The in vitro studies showed a rapid death of Trypanosoma after the treatment with Ascaris fluid at a low concentration, whereas the injection of the fluid to infected mice failed to give positive results. The experimental and control animals died at the same time.
The intestinal bacteria used for the experiments were: B. mesentericus, Lactobacillus acidophilus (stock strain and that isolated from a 5-day-old rat), E. coli, Pseudomonas aeruginosa and Proteus sp. (isolated from the mouse intestine). B. mesentericus was found to inhibit the development of intestinal Trichinella and to a less degree of muscular larvae L. acidophilus, particularly the strain isolated from the stomach reduced the growth of intestinal Trichinella as compared with the control animals. The remaining bacteria used for the experiments Pseudomonas aeruginosa, E. coli and Proteus sp. favour considerably the development of intestinal Trichinella. The number of T. spiralis in the intestine of mice, deprived of bacteria trough sterilization of the alimentary tract, was twice less than control animals.