106 SPECIFICITY OF RICKETTSIA PROWAZEKI 



Result: Guinea-pig 46, inoculated with louse 2 of Box 

 xxxvin, in a preparation of which no rickettsia were found, 

 developed a course of temperature consistent with typhus 

 fever. The infection was proved to be typhus by histological 

 examination. One of two guinea-pigs inoculated with blood 

 from guinea-pig 46 developed a reaction consistent with 

 typhus. 



Conclusion: Louse 2 of Box xxxvin, in a preparation of 

 which no rickettsia were found, contained the virus of typhus. 



Record of Guinea-pig 47> inoculated with rickettsia-infected 

 louse 3 of Box XXXVIII 



The temperatures following the inoculation on May 24th 

 were as follows: 



F. F. 



May 24 102.5 June 11 103.6 



25 102.6 " 12 103.8 



" 26 103.2 " 13 104.0 



" 27 103.0 " 14 102.8 



" 28 103.0 15 102.0 



" 29 103.2 16 No record 



" 30 103.0 17 No record 



" 31 102.6 18 103.0 



June 1 102.0 19 102.4 



2 104.0 " 20 No record 



" 3 103.8 u 21 102.7 



4 103.0 22 No record 



5 105.0 23 102.4 



6 104.8 24 No record 



7 104.0 " 25 102.2 



8 104.0 26 No record 



9 104.0 " 27 102.2 



10 104.0 



On June 28th this guinea-pig was inoculated intraperitone- 

 ally with 5 c.c. of blood from patient 814 (eighth day of typhus) 

 and the subsequent temperatures were as follows: 



