MICROORGANISMS AS A CAUSE OF DISEASE 189 



b. Anaerobic or microaerophilic. 



(1) Non-spore producing. 



Short bacillus type. Abortion bacillus group (13). 

 Long slender beaded rods. Necrosis bacillus group (14). 



(2) Spore producing. Anaerobic spore-producing group (15). 



C. Cells spiral. Spirilla. 



1. Spirillum or Asiatic cholera group (16). 



2. Spirochaete group (17). 1 



D. Cells elongate, forming threads, branched. Actinomyces group (18). 



II. Yeasts or yeast-like forms. Blastomyces group (19). 



III. Molds or mold-like forms. >Hyphomycete group (20). 



1 The spirochaetes, on account of their protozoan resemblances, are grouped 

 with the protozoa and not the bacteria. 



