680 INDEX OF INFECTIOUS DISEASES. 



cause of acute osteomyelitis ; but though present in many cases, alone 

 or associated with other bacteria, this is not the only organism found 

 in the affection. Staphylococcus pyogenes albus, streptococcus pyo- 

 genes, pneumococcus, and bacillus typhosus have also been found in 

 osteomyelitis by various observers. This disease cannot, therefore, 

 be regarded as a specific infection, but is rather a localized infectious 

 process due to various micro-organisms. Chronic osteomyelitis and 

 periostitis may also be considered in like manner as localized infec- 

 tions due to the tubercle bacillus. 



Otitis Media. The micro-organisms most frequently found in 

 the purulent discharges in recent cases of otitis media are : Pneumo- 

 coccus, streptococcus, Staphylococcus pyogenes aureus and albus, and 

 Friedlander's bacillus. Occasionally found are : Bacillus pyocyaneus, 

 micrococcus tetragenus, bacillus coli com munis, and diphtheria ba- 

 cillus, etc. These bacteria are undoubtedly responsible, directly or 

 indirectly, for the inflammatory process and pus formation. 



Ozsena. According to the investigations of Babes, Hajek and 

 others the micro-organisms most constantly found in the nasal 

 secretions of this affection are : Friedlander's bacillus, or a capsule 

 bacillus closely resembling this, and the bacillus ozsense of Hajek, 

 though other species of bacteria are also often present. 



Parotitis. Simple uncomplicated mumps is probably due to 

 some specific micro-organism not as yet discovered, but the suppura- 

 tive inflammation is undoubtedly caused by one or other of the 

 ordinary pyogenic cocci. In parotitis occurring as a complication 

 of other infectious diseases, as pneumonia and typhoid fever, the 

 specific infective agents of these affections have been obtained in 

 pure culture from the pus of the parotid abscess. 



Pericarditis. Various micro-organisms have been found in the 

 pericardial sac in pericarditis the ordinary pus cocci, pneumococci, 

 bacillus pyocyaneus, tubercle bacilli, etc. 



Peritonitis. Among the bacteria found commonly in peri- 

 tonitis are : The ordinary pyogenic micrococci, the colon bacillus, 

 449, 453, the pneumococcus, gonococcus, typhoid bacillus, tubercle 

 bacillus, and proteus vulgaris. The pus cocci, especially strepto- 

 coccus and the colon bacillus, appear to be the usual cause of the 

 inflammatory process in puerperal peritonitis. In peritonitis fol- 

 lowing appendicitis and intestinal injuries the colon bacillus is 

 always present either alone or associated with other bacteria. 



Pleuritis. Levy (1895), from a resume of the literature of the 

 subject, arrives at the conclusion that the pneumococcus is the usual 



