While officials of the National Foundation for Infantile Paralysis sat on the edge of their chairs, Virus Expert Jonas E. Salk of the University of Pittsburgh gave out up-to-date details last week of the vaccine (TIME, Feb. 9) which, it is hoped, can defeat polio. Key points in his review: ¶The virus can be readily cultivated in tissues from monkeys' kidneys. This process gives a higher yield than using monkey testicles (on which earlier experiments were made) and is safer than using brain tissues. ¶After the virus has been killed with formaldehyde, it can still stimulate the human defensive system...
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