EXERCISE XCIX. BACTERIUM WELCHII Mig. 



BACILLUS AEROGENES CAPSULATUS. 



First described by Welch in 1892. Occurs at autopsies in which gas bubbles are present in the larger vessels, accompanied by the 

 formation of numerous small cavities in the liver containing gas. It has been found also in emphysematous phlegmons, in puerperal 

 sepsis, in peritonitis and in other conditions (M. & W.). Widely distributed in nature. (Welch.) 



REFERENCES. Welch and Nuttall: Bull. Johns Hopkins Hospital, 1892, 8; 81; Welch & Flexner: Jour. Exp. Med., 1896, 1; 5; H. 140; 

 M. & W. 173; McF. 463; P. 545; S. 731. 



PHYSIOLOGICAL CHARACTERS. 



i. Relation to temperature:.. 



2. Relation to free oxygen: 



3. Relation to other agents, such as: 



'desiccation, light, disinfectants, etc.:. 



4. Pigment production: 



5. Gas production in glucose media: 



a. Shake culture 



*. Fermentation tube, growth in: (i) open arm: 



(3) rate of development: 24 hours percent., 48 hours. 



(4) reaction in open arm: 



6. Acid or alkali production, litmus milk 



7. Reduction of nitrates: to nitrites 



8. Indol production; 24 hours 48 hours 



fecal odor; 24 hou rs , 48 hours 



9. Enzyme production : proteolytic 



...(2) closed arm: 



.per cent., 72 hours per cent., 



...(5) gas formula, H : CO : : 



hours.. 



percent. 



to ammonia.. 



days, 

 days. 



.diastatic. 



10. Characteristic odor. 



11. Pathogenesis 



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