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Updated: June 8, 2025
This rebel by every step forward renders himself liable to greater and greater penalties, and so cannot afford to pause or fail in one single step. One of Nature's most powerful agencies in thwarting his determination to live is found in disease-producing parasites. "Where there is one man of first-rate intelligence now employed in gaining knowledge of this agency, there should be a thousand.
The disease-producing protozoa of this kind are frequently parasitic in the blood of man and animals, and were only recently recognised, after the disease-producing bacteria of many kinds had been thoroughly studied.
Nature provides at least three varieties of defence within the blood of higher animals against disease-producing microbes which have broken through the outer line of fortification, the skin. These latter agents, actual particles of the living animal in which they exist, are the "eater-cells," or "phagocytes" minute, viscid, actively moving cells, resembling the animalcules called "amoeba."
The existence of grave constitutional disease, such as Bright's disease, diabetes, syphilis, scurvy, or alcoholism, also impedes healing. Infection by disease-producing micro-organisms or pathogenic bacteria is, however, the most potent factor in disturbing the natural process of repair in wounds.
ABSCESS. This is an accumulation of pus in the tissues. It may be due to a severe bruise or contusion that is followed by the infection of the part with some of the pus-producing bacteria. Abscesses occur in certain infectious diseases. In strangles, the disease-producing organism may be carried to different regions of the body by the circulatory vessels.
The second group is conveyed by insects biting people or animals infected with the disease, and subsequently biting people who are healthy. In this way the disease-producing organism is introduced into the body of the healthy person, and beginning to multiply, brings about the symptoms of the disease.
In those parts of the lungs that are not used, slimy secretions accumulate, irritating the air cells and other tissues, which become inflamed and begin to decay. Thus a luxuriant soil is prepared for the tubercle bacillus, the pneumococcus and other disease-producing bacilli and germs.
This infectious disease of poultry is especially common in chickens. It is characterized by a catarrhal and diphtheritic inflammation of the mucous membranes of the head. The specific cause of roup has not been determined. The disease-producing germs are present in the discharges from the nostrils, eyes and mouth, and the body excretions of sick birds.
If any of the animals are affected with an infectious disease, such as tuberculosis or glanders, the moisture and dust may act as carriers of the disease-producing germs. Infectious diseases spread rapidly in crowded, poorly ventilated stables.
The germs are our good friends and if we treat ourselves properly they will do all they can to help keep the water, the earth and the air in fit condition for our use." Such teachings have the advantage of being true. They are helpful and healthful. The popular teachings are disease-producing. The mental depression and bodily inhibition caused by fear are injurious.
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