Abstract
Muckenfuss, Armstrong, and McCordock1, 2 and Webster and File3 have reported that the encephalitis epidemic in St. Louis during the summer and autumn of 1933 is communicable, by inoculation, to monkeys and mice. In addition, Webster and Fite3 reported that the encephalitis prevailing in Kansas City at the same time is likewise communicable to mice; that the infectious agent from the St. Louis and Kansas City cases is filterable, is readily transmissible to mice, is highly virulent when instilled into the nasal passages of mice, and is neutralized by the serum of encephalitis convalescents from the 1933 epidemic.We have continued our studies of the effect on the encephalitis virus of various sera derived from cases of encephalitis and from immunized monkeys, and will report the result of these tests in the present paper.Monkeys injected with the virus develop in their sera protective properties similar to those in the sera of convalescent St. Louis and Kansas City encephalitis cases. Again, serum from a mo...
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