Abstract
Summary
1. Of approximately 100 female Aedes egypti, 46 to 47 fed upon a Macacus rhesus monkey inoculated intracerebrally with the Aycock strain of poliomyelitis virus and later 89 to 93 of these females fed upon a normal monkey at dates ranging from 5 to 28 days after the feedings upon the inoculated animal following first symptoms. Similarly, of approximately 75 female Culex pipiens, at the same intervals, 16 to 18 fed upon the inoculated animal and 38 to 41 of the same original group fed upon the normal monkey. 2. At the end of the experiment the remaining female mosquitoes were chloroformed, ground, suspended in Tyrode solution, and the filtered solution inoculated intracerebrally into another normal monkey. 3. Neither of these normal animals, inoculated either by cerebral injection or exposure to supposedly infected mosquitoes, developed any symptoms of poliomyelitis in the 3 weeks period of observation.
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