Scientists who have been experimenting with poliomyelitis (infantile paralysis) virus have been considerably hampered because the only animal they could infect was the expensive rhesus monkey. Last year Dr. Charles Armstrong of the U. S. Public Health Service finally succeeded in giving polio to ordinary cotton rats. That hurdle passed, he was able to pass the infection from cotton rats to mice.
Last fortnight, in the Rockefeller Journal of Experimental Medicine, Drs. Claus W. Jungeblut and Murray Sanders of Columbia University announced the next step: successful immunization of monkeys against polio. First they took a strain of live polio virus...
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