. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. 6io Asiatic Cholera water from polluted gutters; how they enter milk with water used to dilute it; how they appear to be carried about in clothing and upon food-stuffs; how they can be brought to articles of food by flies that have preyed upon cholera excrement; and other interesting modes of infection. The hterature is so vast that it is scarcely possible to mention even the most instructive examples, A bacteri- ologist became infected while experimenti
. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. 6io Asiatic Cholera water from polluted gutters; how they enter milk with water used to dilute it; how they appear to be carried about in clothing and upon food-stuffs; how they can be brought to articles of food by flies that have preyed upon cholera excrement; and other interesting modes of infection. The hterature is so vast that it is scarcely possible to mention even the most instructive examples, A bacteri- ologist became infected while experimenting with the cholera spirilla in Koch's laboratory.* It is commonly supposed that the cholera organism may remain alive in water for an almost unUmited length of time, but experiments have not shown this to be the case. Thus, Wdghiigel and Riedel have shown that if the spirilla be planted in sterihzed water they grow with great rapidity after a short time,. Fig. 243.—Spirilla of Asiatic cholera, from a bouillon culture three weeks old, showing long spirals. Xiooo (Frankel and PfeifEer). and can be found ahve after months have passed. Frankel, how- ever, points out that this ability to grow and remain vital for long periods in sterihzed water does not guarantee the same power of growth in unsterilized water, for in the latter the simultaneous growth of other bacteria serves to extinguish the cholera spirilla in a few days. Morphology.—The micro-organism is a short rod i to 2 /< in length and /z in breadth, with rounded ends, and a distinct curve, so that the original name by which it was known, the "comma bacillus," applies very well. One of the most common forms is that in which two short curved individuals are conjoined in an S-shape. When the conditions of nutrition are good, multipUcation by fission progresses with rapidity; but when adverse conditions arise, long spiral threads—-unmistakable spirilla—-develop. Frankel found *Deutsche. med. Wochenschr
Size: 1583px × 1579px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbacteri, bookyear1919
