. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . t part in the disease and leadingoften to serious complications (sepsis and bronchopneumonia). Investi-gations indicate that when other pathogenic bacteria are associatedwith the diphtheria bacilli they mutually assist one another in theirattacks upon the mucous membrane, the streptococcus being par-ticularly active in this respect, often opening the way for the invasionof the LofHer bacillus into the deeper tissues or supplying needed con-ditions for the development of its toxin. In most fatal cas
. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . t part in the disease and leadingoften to serious complications (sepsis and bronchopneumonia). Investi-gations indicate that when other pathogenic bacteria are associatedwith the diphtheria bacilli they mutually assist one another in theirattacks upon the mucous membrane, the streptococcus being par-ticularly active in this respect, often opening the way for the invasionof the LofHer bacillus into the deeper tissues or supplying needed con-ditions for the development of its toxin. In most fatal cases of broncho-pneumonia following laryngeal diphtheria we find not only abundantpneumococci or streptococci in the inflamed lung areas, but also inthe blood and tissues of the organs. *As these septic infections due tothe pyogenic cocci are in no way influenced by the diphtheria antitoxin,they frequently are the cause of the fatal termination. Other bacteriacause putrefactive changes in the exudate, producing alterations incolor, e. g., B. pyocyaneus and offensive odors, e. g., Fig. 123.—Vincents bacillus with accompanying spirochetes. Pseudomembranous Exudative Inflammations Due to Bacteriaother than the Diphtheria Bacilli.—^The diphtheria bacillus, though themost usual, is not the only microorganism that is capable of produc-ing pseudomembranous inflammations. There are numerous bacteriapresent almost constantly in the throat secretions, which, under certainconditions, can cause local lesions very similar to those in the less-marked cases of true diphtheria. •The streptococcus and pneumococcusare the two forms most frequently found in these cases, but thereare also others, such as Vincents bacillus, which, under suitable condi-tions, excite this form of inflammation, but without serious constitu-tional symptoms. The pseudomembranous. angina accompanying scarlet fever, andto a less extent other diseases, may not show the presence of diphtheria 308 BACILLU
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