THE BACTERIOLOGICAL EXAMINATION OF THE BLOOD 187 



tity of blood were examined) and in septicaemia and ulcerative 

 endocarditis when due to this organism. When found in the 

 blood by ordinary methods it always indicates a bad prog- 

 nosis, and suggests the use of vaccine. 



6. Typhoid bacilli. (See p. 82.) 



7. The bacillus of glanders may be found in acute cases of 

 that disease, but its isolation and identification are matters for 

 an expert. 



8. The influenza bacillus is present in some or, according to 

 some authorities, all cases of influenza. It may be searched 

 for in films, but no importance should be attached to a nega- 



FIG. 30. SPIRILLUM OF RELAPSING FEVER. 



tive result. Cultures of this organism have been obtained 

 in some cases of ulcerative endocarditis. 



9. The Bacillus of Plague. This organism is often present 

 in the blood in relatively large numbers, and the disease can 

 usually be diagnosed after a careful search through a number 

 of suitably stained films. But the investigation of a drop of 

 fluid drawn from the bubo (if one is present) permits of an 

 easier and earlier diagnosis. The blood examination is of 

 most value in the pulmonary and septicaemic forms of plague. 



10. The spirillum of relapsing fever is easily found, for it 

 possesses well-marked characters and is present in great num- 

 bers. The diagnosis of relapsing fever cannot be made until 



