54 



SPECIFICITY OF RICKETTSIA PROWAZEKI 



From these lice the following preparations were made:'"' 



Louse No. 



Smears 



W236 



W237 



W238 



W239 



W240 

 W241 



Sections 



W228 



W230 



W231 



W232 1 



W232 2 



Result of Microscopical 

 Examination 



Rickettsia absent 

 Rickettsia absent 

 Rickettsia present 

 Rickettsia absent 



Rickettsia absent 

 Rickettsia present 



Rickettsia present 

 Rickettsia present 

 Rickettsia present 

 Rickettsia absent 



Result of Animal Inoculation 



Guinea-pig 11; Temp. 

 Proved susceptible to blood from a 

 typhus patient 

 Guinea-pig 17; Temp. 

 Proved susceptible to blood from a 

 typhus patient 

 Guinea-pig 20; Temp. + 

 Lesions present. Blood proved in- 

 fectious in subinoculations 

 Guinea-pig 19; Temp. + 

 Lesions present. Blood proved in- 

 fectious in subinoculations 

 Guinea-pig 21 ; Temp. 

 Guinea-pig 22; Temp. + 



Record of Guinea-pig 11, inoculated with rickettsia-free 

 louse W 236 



From May 15th to June 22d the temperature of this guinea- 

 pig remained within normal limits. On June 22d it was tested 

 for susceptibility by the injection of 5 c.c. of blood from patient 

 799. The temperatures subsequent to this inoculation were as 

 follows: 



June 22 No record 



23 103.3 



24 No record 



25 101.8 



26 No record 



27 . 102.6 



28 No record 



29 102.8 



30 102.4 



July 1 104.2 



2 No record 



3 104.4 



4 105.4 



5 . . 105.3 



July 6 .......... No record 



7 .......... 105.4 



8 .......... 104.4 



9 .......... No record 



10 

 11 

 12 

 13 

 14 



102.0 

 103.1 

 102.1 

 102.4 

 101.9 



15 .......... No record 



16 .......... 101.6 



17 .......... 102.5 



18 . . Killed 



