136 THE ACUTE SELF-LIMITED INFECTIONS 



collecting over night, appear as short end-to-end ovoid 

 rods, each about TSTTHF inch. long. They may be 

 cultivated at body temperature on media containing 

 blood or blood serum. They produce disease by their 

 presence and by some form of toxin little understood. 

 The disease does not affect animals. 



FIG. 40 



Koch-Weeks bacillus (pink-eye), 3d generation. X 1000 diameters 

 (Weeks.) 



PERTUSSIS OR WHOOPING COUGH 



Many different organisms have been held responsible 

 for this disease. The one now holding the field was 

 described by Bordet and Gengou several years ago, 

 but only cultivated artificially within the last few 

 years. Although the discoverers failed to produce the 

 disease in monkeys when using this bacillus, never- 

 theless they hold that the presence of agglutinins and 

 a refined blood reaction, called complement deviation, 

 in the blood of patients are sufficient to incriminate it 



