PATHOGENIC BACTERIA 157 



into the circulation. The blood and juices have a peculiar 

 stringy, fibrinous consistence. 



Fig. 92. Pfeiffer's capsule bacillus in blood (X 1000) (Friinkel and Pfeiffer). 



Bacillus of Influenza (Pfeiffer, 18Q2). Origin. A small 

 bacillus, about one-half the size of the bacillus of mouse septi- 

 cemia, and arranged in chain form. It develops upon blood- 

 serum agar. It is aerobic, without movement; does not take 

 the Gram stain (Fig. 93). 



Stain, It is best stained with diluted carbol-fuchsin, the 

 contrast-stain being Loffler's methylene-blue. 



Growth. Upon glycerin-agar, over which a drop of blood 

 has been spread, in an incubator at the end of twenty-four 

 hours, a very delicate growth occurs, which resembles condensed 

 moisture. 



Pathogenesis. It is found in the sputum and in the bron- 

 chial nasal secretions and blood of influenza patients. It has 

 been transmitted to monkeys; other animals are not suscep- 

 tible. It has never been found outside the body. Its resist- 

 ance is very feeble; in water, the bacilli die in twenty-four 



