Excerpt from Vaccine and Serum Therapy, Including Also a Study of Infections, Theories of Immunity, Opsonins and Opsonic Index Besides conditions in the causal organism, certain conditions must exist in the host or body so that infection can occur. Cer tain animals are insusceptible to the action of certain Species of microorganism, thus for example, the horse and other domestic animals are naturally immune to venereal diseases. Again cer tain organisms can only produce disease when they are present in certain parts of the ...
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Excerpt from Vaccine and Serum Therapy, Including Also a Study of Infections, Theories of Immunity, Opsonins and Opsonic Index Besides conditions in the causal organism, certain conditions must exist in the host or body so that infection can occur. Cer tain animals are insusceptible to the action of certain Species of microorganism, thus for example, the horse and other domestic animals are naturally immune to venereal diseases. Again cer tain organisms can only produce disease when they are present in certain parts of the body and have entered the body by certain portals of entry. The spirillurn cholerae can only produce its typical form of disease when it has gained entrance through the small intestine. Invasion of the dermis or epidermis by-this or ganism produces no disease. The bacilli producing tuberculosis as well as certain other organisms, can cause infection when they have entered through the skin or through the mucous membrane. Certain organisms as Bact. Diphtheriae, B. Tuberculosis, and B. Typhosus, show predilections for certain tissues but will also pro duce diseased conditions in other parts of the body. In addition to the non - susceptibility of the host, the body possesses certain natural barriers to disease which must be over come before infections can be produced. The unbroken skin usually offers a barrier to infection. Age, sex, race, occupation, etc., at times account for certain resistance to invasions of organ isms. The resistance furthermore varies for the different organ isms, as is evidenced by the fact that for B. Tetanus a wound is necessary to produce lock-jaw, While for the glanders bacillus the slightest abrasion of the maccus membrane will furnish a focus for an infection. The body fiuids,1ymph glands, phagocytes, all offer resistance to infection. T hese barriers are overcome in various ways and under different conditions, so that while indi viduals may be immune at one time they may, at another time, be susceptible to the same infectious agent. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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