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Excerpt from The Sources and Modes of Infection
We need to measure more carefully the relative importance of different sources of disease and different modes of infec tion. It is not so important to know that typhoid bacilli live in water for weeks, as it is to know that 99 per cent die in one week. It is not enough to discover that diphtheria bacilli can be recovered from articles in the sick-room; we must learn how often they are found and how often disease is traced to such a source. We have for years been much alarmed because tubercle bacilli are found in milk, but since a serious effort has been made to measure the actual danger, the alarm has greatly diminished. Doubtless the house fly has been the cause of typhoid fever, but in what percentage of cases we are profoundly ignorant. Healthy carriers of diphtheria have certainly transmitted the disease to others, and we should earnestly try to determine the amount of diphtheria caused in this way. The attempt is made in the following pages to estimate roughly, with the very imperfect material now available, the relative importance of different factors in the extension of infectious diseases. The conclu sions must to a large extent be merely tentative, and as indicating lines for further study.
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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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Excerpt from The Sources and Modes of Infection
We need to measure more carefully the relative importance of different sources of disease and different modes of infec tion. It is not so important to know that typhoid bacilli live in water for weeks, as it is to know that 99 per cent die in one week. It is not enough to discover that diphtheria bacilli can be recovered from articles in the sick-room; we must learn how often they are found and how often disease is traced to such a source. We have for years been much alarmed because tubercle bacilli are found in milk, but since a serious effort has been made to measure the actual danger, the alarm has greatly diminished. Doubtless the house fly has been the cause of typhoid fever, but in what percentage of cases we are profoundly ignorant. Healthy carriers of diphtheria have certainly transmitted the disease to others, and we should earnestly try to determine the amount of diphtheria caused in this way. The attempt is made in the following pages to estimate roughly, with the very imperfect material now available, the relative importance of different factors in the extension of infectious diseases. The conclu sions must to a large extent be merely tentative, and as indicating lines for further study.
About the Publisher
Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
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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Excerpt from The Sources and Modes of Infection
This volume is intended to indicate the principles which should guide sanitary practice, and to show how recent laboratory work and the epidemiological study of disease have modified these principles. When I began work as health officer in 1884 the filth theory was still in favor, and it was generally believed that the germs of disease commonly grew in decaying organic matter. Yet contagion was recognized as an important factor in the spread of disease, and the isolation of the sick was more and more insisted upon. Fifteen years ago probably most health officials believed that the contagious diseases could be completely stamped out if only all persons sick with them could be isolated. The air was thought to be the chief medium for their transmission, and fomites the mechanism for their passage from place to place. Sanitary practice was based on these premises.
My own views concerning these matters became greatly modified year by year, partly owing to the rapidly accumulating knowledge of bacteria and other disease-producing organisms, and partly owing to direct observations on the manner in which the infectious diseases are disseminated, and on the effect of preventive measures.
It now appears that the growth of disease germs outside of the body is not frequent enough to be an important factor in the causation of disease, but their growth in the body without causing sickness, their latency as it were, often for many months, is a factor of very great significance. We know now that direct contact with the sick, or with healthy carriers of disease germs, is an exceedingly frequent mode of transmission, and that infection by means of the air, or from infected articles, is not nearly as common as was formerly believed.
About the Publisher
Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
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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Paperback. Zustand: New. Print on Demand. This book delves into the complex world of infectious diseases, challenging long-held beliefs about their origins and transmission. The author, writing in the early 20th century, traces the evolution of medical understanding from the miasma theory, which posited disease arose from foul air, to the germ theory, which implicated bacteria as the culprit. He then critically examines the prevailing notion that disease germs thrived outside the human body, particularly in decaying organic matter, a theory known as the "filth theory." By meticulously analyzing both laboratory findings and epidemiological data, the author demonstrates that the lifespan of disease germs outside the body is often much shorter than previously thought. He argues that the focus should shift from external sources of infection to the human body itself, highlighting the role of carriers and missed cases in disease transmission. The book challenges the effectiveness of isolation practices in curbing outbreaks, proposing that direct contact is a more frequent mode of infection than previously believed. This thought-provoking work offers a fresh perspective on disease prevention, emphasizing the importance of understanding how germs spread within human populations rather than solely focusing on external factors. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. Bestandsnummer des Verkäufers 9781332198337_0
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