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Updated: May 7, 2025
The micrococcus which causes fowl cholera loses its power if it be cultivated in common culture media, care being taken to allow several days to elapse between the successive inoculations into new culture flasks. Most pathogenic bacteria can in some way be so treated as to suffer a diminution or complete loss of their powers of producing a fatal disease.
But the species of bacteria which are capable of doing us any injury, the pathogenic bacteria, are really very few compared to the great host of species which are harmless. A small number of species, perhaps a score or two, are pathogenic, while a much larger number, amounting to hundreds and perhaps thousands of species, are perfectly harmless.
The future may require us to modify to some extent even the brief outline which has been given. But while we recognise this uncertainty in the details, we may be assured of the general facts. The living body has some very efficacious resistant forces which prevent most bacteria from growing within its tissues, and which in large measure may be relied upon to drive out the true pathogenic bacteria.
Many diseases, such as diarrhoea, enteric fever, and cholera, and perhaps tuberculosis, may be caused by eating infected food. Trichiniasis may also be mentioned. Tinned fish often gives rise to symptoms of poisoning, and shell-fish are not uncommonly contaminated with pathogenic micro-organisms.
But as a general thing the phagocytes do not succeed in making away with all the pathogenic germs, or even with enough of them to prevent the illness which they tend to produce.
Want of rest Irritation Unhealthy tissues Pathogenic bacteria. SURGICAL BACTERIOLOGY General characters of bacteria Classification of bacteria Conditions of bacterial life Pathogenic powers of bacteria Results of bacterial growth Death of bacteria Immunity Antitoxic sera Identification of bacteria Pyogenic bacteria.
"Possibly," returned the other, "and an odd affliction too, you'll allow, yet one not unknown to the nations of antiquity, nor to those moderns, perhaps, who recognize the freedom of action under certain pathogenic conditions between this world and another." "And you think," asked Pender hastily, "that it is all primarily due to the Cannabis?
#Leucocytosis.# Most bacterial diseases, as well as certain other pathological conditions, are associated with an increase in the number of leucocytes in the blood throughout the circulatory system. This condition of the blood, which is known as leucocytosis, is believed to be due to an excessive output and rapid formation of leucocytes by the bone marrow, and it probably has as its object the arrest and destruction of the invading organisms or toxins. To increase the resisting power of the system to pathogenic organisms, an artificial leucocytosis may be induced by subcutaneous injection of a solution of nucleinate of soda (16
The colon bacillus is always present in the lumen of the alimentary canal and, although it is harmless under normal conditions, when these conditions arc changed and there is an abrasion, an abnormal condition of the circulation, or a lack of drainage, it becomes at once actively pathogenic.
Others hold the highly suggestive view that it is a normal inhabitant of the healthy mouth, which can become injurious to the body, or pathogenic, only under certain depressed or disturbed conditions of the latter.
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