BACILLUS CHOLERA SUIS 75 



EXERCISE XXXIV 



BACILLUS CHOLERA SUIS AND BACILLUS TYPHOSUS 



120. 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. 

 colt communis each of these organisms has several varieties. 

 Already several distinct varieties of the hog-cholera bacillus 

 have been described. (The hog-cholera group of Bacteria. 

 Bulletin No. 6, U. S. Bureau of Animal Industry, p. 9.) Cer- 

 tain 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 dem- 

 onstrated, distinct species. The special methods of differen- 

 tiation 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, 

 1898. 



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

 books. Eberth, Virchow's Archiv, Bd. 81 (1880). Ibid., Bd. 83 

 (1881). Gaffky, Mittheilungen aus d. Kais. Gesundheitsamte, II. 

 (1884), S. 372. Losener, Arbeiten aus d. Kais. Gesundheitsamte, 

 XI. (1895). Pdrd, Annales de I'lnst. Pasteur, VI. (1882), p. 512. 

 Jordan^ M'edical News, Sept. 28, 1895. Flexner, The Johns Hop. 

 Hosp. Reports, Vol. V., p. 343. Smith, The Jour, of the Boston 

 Soc. of Med. Sciences, June, 1898. Hiss, The Jour, of Exp. Med., 

 Vol. II. ft8^7), p. 677. 



