Abstract
Conclusions
1. In 11 cases of epidemic typhus treated with hyperimmune rabbit serum, strains were isolated immediately before and again at variable periods after the administration of serum. 2. The only effect observed was that in the postserum isolations the period of incubation in the inoculated guinea pigs was usually, but not always, prolonged. 3. While the effect of the serum upon the agent may be rickettsiostatie, it is believed that a more likely explanation of the favorable clinical effect was due to its antitoxic effect.
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