202 SUMMARY AND CONCLUSIONS 



We conclude that Rickettsia prowazeki is the cause of typhus. 

 Our most important evidence is that contained in the experi- 

 ments from which we have concluded that the virus of typhus 

 and Rickettsia prowazeki are inseparable in infective lice. Next 

 in importance is the fact of the presence of bodies indistinguish- 

 able from Rickettsia prowazeki, demonstrable with great regu- 

 larity, in the lesions of typhus in man. 



