68 



SPECIFICITY OF RICKETTSIA PROWAZEKI 



From these lice the following preparations were made : 



Louse No. 



Smears 



W211 



W212 

 W213 

 W214 

 W215 

 W216 



Sections 



W203 



W204 1 



W204* 



W205 



W206 1 



W206* 



W208 



Result of Microscopical 

 Examination 



Rickettsia present 

 Rickettsia absent 

 Rickettsia absent 

 Rickettsia absent 

 Rickettsia absent 

 Rickettsia absent 



Rickettsia absent 

 Rickettsia absent 

 Rickettsia present 

 Rickettsia absent 

 Rickettsia absent 

 Rickettsia absent 

 Rickettsia absent 



Result of Animal Inoculation 



Guinea-pig 13; Temp, + 



Proved immune to inoculation 



Guinea-pig 7; Temp. 



Proved susceptible to inoculation 



Guinea-pig 14; Temp. + 



Lesions present 



Guinea-pig 8; Temp. + 



Proved immune to inoculation 



Guinea-pig 18; Temp, -f- 



Lesions present 



Guinea-pig 12; Temp. 



Proved susceptible to inoculation 



with blood from a typhus patient 



Record of Guinea-pig 13, inoculated with the viscera of 

 rickettsia-infected louse W 211 



The temperatures following the inoculation on May 15th 

 were as follows: 



May 15 101.7 



June 3 104.6 



4 103.0 



" 5 104.0 



" 6 104.0 



7 103.4 



" 8 103.0 



9 102.0 



10 103.0 



a 11 103.0 



" 12 102.4 



13 102.4 



a 14 102.8 



" 15 102.0 



16 103.2 



" 17 No record 



18 103.6 



" 19 103.2 



" 20 No record 



" 21 . . 105.0 



