Abstract
Summary
Mixtures of variola virus diluted 101 and vaccinia virus diluted 106 were inoculated in embryonated eggs and followed by 3 or more successive transfers. In 5 of the 6 tests the highly diluted vaccinia virus was masked in the 1st transfer but subsequently multiplied and predominated by the 3rd. Two of the transferred mixtures on inoculation in rabbits produced a typical vaccinial reaction in dilutions through 106.
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