EXERCISE 92. CHOLERA GROUP. 



251 



Microspira comma (KOCH) SCHROETER. 



SYNONYMS. Spirillum cholerae-asiaticae ZOPF ; Vibrio cholerae 

 LEHM. & NEUM. ; Comma bacillus ; Cholera bacillus. 



EXPLANATORY. First described by Koch in 1884. Found in 

 the intestinal contents of cholera patients. It has also been isolated 

 several times from water supplies. 



REFERENCES. Koch, Berl. Klin. Wochenschr., 1884, no. 31 u. 32 ; 

 A. 446 ; C. 335 ; Fl. 2, 527 ; H. 333 ; K. & W. Ill, 1 ; L. & N. 353 ; Mig. 

 2, 960 ; M. & R. 407 ; M. & W. 152 ; McF. 442 ; P. 568. 



MORPHOLOGICAL CHARACTERS: SKETCHES. 



1. FORM AND ARRANGEMENT: 



a. Bouillon 



b. Agar 



c. Gelatin 



d. Other media 



2. SIZE: 



3. STAINING POWERS: 



a. Aqueous gentian- violet 



b. Loeffler's methylen-blue , 



c. Gram's stain , 



d. Special stains , 



4. MOTILITY : 



a. Character of movement 



b. Flagella stain 



5. SPORES : 



6. SPECIAL CHARACTERS : 



a. Capsules 



&. Involution forms > 



c. Deposits or vacuoles 



d. Pleomorphism 



