. The chemical activities of bacteria. Bacteria. VIRULENCE 187 the organisation or metabolism of the host, which becomes apparent as cHnical disease. Bacteria may enter the tissues in a variety of ways: through the respiratory passages, through the tonsils, through the intestinal wall or, above all, through any type of wound. If saprophytic bacteria enter by any of these routes, they are rapidly and effectively destroyed by the reticulo-endothelial system, but a pathogenic organism is able to grow within the host's tissues and its capacity to do so is a measure of its. Fig. 13. " virulenc
. The chemical activities of bacteria. Bacteria. VIRULENCE 187 the organisation or metabolism of the host, which becomes apparent as cHnical disease. Bacteria may enter the tissues in a variety of ways: through the respiratory passages, through the tonsils, through the intestinal wall or, above all, through any type of wound. If saprophytic bacteria enter by any of these routes, they are rapidly and effectively destroyed by the reticulo-endothelial system, but a pathogenic organism is able to grow within the host's tissues and its capacity to do so is a measure of its. Fig. 13. " ; Fig. 13 shows the effect of injecting 1 million streptococci into the blood-stream of a healthy animal. If the organisms belong to an avirulent strain (Case 1), then there is a steady decrease in the number of bacterial cells in the blood-stream from the time of injection until eventual disinfection. If the strain is highly virulent (Case 3), then, after an initial decrease in numbers, the organism begins to multiply rapidly and there is a steadily increasing number of organisms in the blood-stream until eventually the host dies as a result of their activities. In the intermediate case of a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gale, E. F. (Ernest Frederick). New York, Academic Press
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectbacteria
