PATHOGENIC BACTERIA 149 



many other pathologic processes have shown them, they can 

 hardly be set down as the sole cause of pneumonia. 



Klebs in 1875 called attention to the presence of bacteria in 

 pneumonia, and in 1882 Friedlander developed a bacillus from 

 the lung tissue of a pneumonic person, which he thought was a 

 coccus, and called it pneumococcus. 



In 1886 A. Frankel and Weichselbaum proved that this 

 organism was not constant in fact, was rare. 



Fig. 86. Bacillus pneumonias of Friedlander, from the expectoration of a 

 pneumonia patient (x 1000) (Frankel and Pfeiffer). 



A. Frankel obtained in the majority of cases of pneumonia 

 an organism that he had described in 1884 under the name 

 of sputum-septicemia micrococcus. 



Weichselbaum called it Diplococcus pneumonia, and believed 

 it to be the real cause of pneumonia. It has been found in 

 many other serous inflammations, and also in the mouths of 

 healthy persons. It is the generally accepted organism of the 

 disease, and can be isolated from nearly all cases of acute 

 croupous pneumonia. It is found in about three-quarters of 

 all cases of pneumonia. 



