CHAPTER XXVIII. 

 THE PASTEURELLA GROUP OF BACILLI. 



Introduction. 



1. Pasteurella gallinse, p. 447. 

 Section I. Experimental inoculation, p. 448. 

 Section II. Morphology, p. 449. 



Section III. Biological properties, p. 451. 



Section IV. The isolation and identification of the bacillus, p. 452. 

 Similar organisms in epizootics among other birds, p. 452. 



2. Pasteurella cuniculi, p. 453. 



3. Pasteurella suis, p. 454. 



4. Pasteurella bovis, p. 455. 



5. Pasteurella ovis, p. 456. 



6. Pasteurella capree, p. 456. 



7. Pasteurella equi, p 456. 



8. Pasteurella canis, p. 457. 



M'Gowan's bacillus of distemper, p. 459. 



9. Immunization with polyvalent vaccines, p. 459. 



SINCE the discovery by Pasteur of the organism which is the cause of the 

 disease known as fowl cholera, a similar organism has been isolated by 

 many observers from epizootics affecting widely different species of animals. 

 The similarity between the organisms obtained from different animal 

 species soon attracted attention. Hueppe classified in one group the 

 epizootic diseases affecting fowls, pigs, rabbits, ferrets, cattle and wild 

 animals, and described them as the " hcemorrhagic septiccemias." Nocard 

 and Leclainche proceeding further in the generalization, affirmed that the 

 causal organisms of all these diseases were merely varieties of one and the 

 same organism to which they applied the term the " ovoid bacterium " (la 

 bacteridie ovoide) : but to perpetuate the discovery of the organism of fowl 

 cholera by Pasteur, Toni and Trevisan appropriately suggested the use of 

 the term Pasteurella in place of bacteridie ovoide. Lignieres from a study of 

 the organisms isolated from birds, pigs, cattle, etc., came to the conclusion 

 that varieties of the Pasteurella could be distinguished by means of their 

 pathogenic properties, and recent researches especially those of Chamber- 

 land and Jouan have justified this view. Consequently, as Nocard held, 

 the organisms isolated from different animal species must be regarded as 



