Abstract
Summary
Typhus vaccine, consisting of killed rickettsiae from infected rat lungs prepared according to the method of Castaneda, protected guinea pigs against infective doses of virus injected intra-peritoneally. Immunization was accomplished by the subcutaneous injection of the vaccine in as small a dose as 0.2 cc. The virus used in the preparation of the vaccine and for the test for immunity was the “L” strain of Mexican typhus.
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