The experiments were made to establish the route of natural infection of Encephalitozoon under various conditions. No increase in infectivity was noted in this experiment under the contaminated conditions of the cage and its surrounding during the period of observation. No increase in infectivity was noted in the experiment, in which known infected mice and healthy mice were kept together in the same cage during the period of observation. Infective Encephalitozoon were excreted in the urine of infected mice. Establishment of Encephalitozoon infection was not seen by innoculating the feces of infected mice into healthy mice. Administration of the organisms by mouth did not establish infection. In view of the above facts, the establishment of the natural infection is not seen under a condition contaminated by the excreted organisms alone. Certain additional contributing factors and chances seem to be necessary.
Trans. of Keio Igaku (Japan) v37 p515-518 1960. DOI: 10.21236/AD0838810