Abstract
Summary
The results of experiments here reported show that the MEFl, a Lansing type of poliomyelitis virus, can be adapted to infant mice in which the virus develops an LD50 titer in excess of that found, as a rule, in adult mice. In the medium of newborn mouse brain, and in such an increased titer, the virus now lends itself to the preparation of a suitable antigen for specific and reproducible complement fixation.
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