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The TO strain of mouse encephalomyelitis virus is the original strain of an agent isolated by Theiler from a spontaneous disease in mice. The agent has been used for much laboratory investigation related to poliomyelitis since there are many similarities between the Theiler virus and the agent of poliomyelitis.
Herdis von Magnus, in her paper, reports on a series of interesting studies on the epidemiology of this disease in the natural host.
Studies on Mouse Encephalomyelitis Virus: TO Strain; Observations on the Oral Route of Infection and on the Epidemiology of the Disease.. AMA Arch Intern Med. 1954;93(3):478. doi:10.1001/archinte.1954.00240270164022