Abstract
Summary
When mice are inoculated by the intranasal route with mixtures of murine and classic typhus the strains are carried on for an indefinite number of transfers and then both viruses can be isolated by inoculation into series of male and female guinea pigs. Serial transfers in both sexes seem to favor the prevalence of one or the other virus. Males favor the isolation of the murine type while females favor the preservation of classic typhus.
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