. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. 43° Diphtheria line rather than an acid reaction by their growth in bouillon. The pseudo-diphtheria bacilli were found in about i per cent, of throats examined in New York; they seem to have no relationship to diph- theria, and are never virulent. Morphology.—-This micro-organism bears a more or less marked resemblance to Bacillus diphtheriae, but differs in certain particulars that usually make it possible to recognize and identify it. It is shorter and
. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. 43° Diphtheria line rather than an acid reaction by their growth in bouillon. The pseudo-diphtheria bacilli were found in about i per cent, of throats examined in New York; they seem to have no relationship to diph- theria, and are never virulent. Morphology.—-This micro-organism bears a more or less marked resemblance to Bacillus diphtheriae, but differs in certain particulars that usually make it possible to recognize and identify it. It is shorter and stouter than its relative, is straight, usually slightly clubbed. It usually stains intensely, and commonly shows but one unstained transverse band. When the bacilli are short and have a single band, they may resemble cocci. When longer they may show two transverse bands. There are no flagella and no Fig. i6i.—Pseudo-diphtheria bacilli. Staining.—The organism stains intensely and more uniformly than Bacillus diphtheriae. When colored by Neisser's or Roux's method, no metachromatic end bodies can be defined. Cultivation.—The organism is usually discovered in smears made for the diagnosis of diphtheria, and sometimes occasions considerable confusion through its cultural similarities and morphologic resem- blances to Bacillus diphtheriae. It grows more luxuriantly upon the ordinary culture-media than B. diphtheria. The colonies are larger, less transparent and whiter, as seen upon agar-agar. In bouillon there is more marked clouding and less marked pellicle formation. Upon Loffler's blood-serum the cultures are too much ahke to be easily differentiated. G. F. Petri* found no substances in filtrates of cultures of Hof- mann's bacillus capable of neutralizing diphtheria antitoxin; he also found that horses immunized with large quantities of filtrates of the * "Jour, of Hygiene," April, 1905, vol. v, No. 2, p. Please note that these images are extra
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbacteri, bookyear1916
