BACILLUS CHOLERiE SUIS 79 



EXERCISE XXIX 



BACILLUS CHOLERA SUIS AND BACILLUS TYPHOSUS 



119. The bacilli of typhoid fever and of hog cholera resem- 

 ble each other very closely morphologically and in certain 

 of their cultural characters and biochemic properties. Like 

 B. coli communis each of these organisms has several varieties. 

 Already several distinct varieties of the hog-cholera bacillus 

 have been described.^ 



Certain of the varieties of these species approach each other 

 very closely, while others approach B. coli communis in their 

 various manifestations. It is important, therefore, that the 

 morphology and properties of each of these species should be 

 carefully determined. The fact should be kept clearly in mind 

 that while these two species and the colon bacillus resemble 

 each other in certain directions, they are, so far as has yet 

 been demonstrated, distinct species. The special methods of 

 differentiation must be omitted from this elementary course. 

 Read carefully the chapter on B. typhosus in the text-book. 



References. To hog cholera. Salmon, Special Report on Hog 

 Cholera, Bureau of Animal Industry, U. S. Depart, of Agric, 1889. 

 Smith, Bulletin No. 6, Ibid., 1894. Moore, Report N. Y. State 

 Commissioner of Agriculture, 1897. The Am. Vet. Review, March, 



References. To typhoid. Chapters on this organism in text- 

 books. Eberth, Virchow's Archiv, Bd. 81, 1880. Ibid., Bd. 

 83, 1 88 1. Gaffky, Mittheilungen aus d. Kais. Gesundheitsamte, 

 Vol. II, 1884, S. 372. Losener, Arbeiten aus d. Kais. Gesund- 

 heitsamte, Vol. XI, 1895. Perd, Annales de I'lnst. Pasteur, Vol. VI, 

 1882, p. 512. Jordan, Medical News, September 28, 1895. Flexner, 



1 The hog-cholera group of bacteria, Bulletin No. 6, U. S. Bureau of 

 Animal Industry, p. 9. 



