Abstract
Summary
Mice which developed paralysis within 5 days after an intracerebral inoculation of Lansing strain of poliomyelitis virus had approximately as much virus in the brain as in the spinal cord-medulla. After 5 days little or no virus was recovered from the brain although pools of cord-medulla of mice which became paralyzed up to 4 weeks after injection were found to contain as much virus as did the pool of the first 5 days.
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