MAURICE BRODIE, M. D. AND WILLIAM H. PARK, M.D.
JOURNAL of the American Medical Association 105 no. 14 (Oct. 5, 1935) :1089-1093
Page 5. We were able to render mice susceptible to the virus of poliomyelitis by subjecting them to repeated x-ray exposures and to transfer the infectious agent serially to normal mice.
Page 7. They have shown that the exposure of mice to x-rays renders them susceptible to the infection and it may be that some such method will be developed by which virus will be available on a large scale.
The infectious agent is the poison they created which is defined as virus.
The “virus” of polio was ground-up human spinal cord. See Flexner 1910.
Jim O’Kelly Founder of the Anti-Vaccination league of America.