Excerpt from Carriers in Infectious Diseases: A Manual on the Importance, Pathology, Diagnosis and Treatment of Human Carriers; With a Section on Carriers in Veterinary Medicine In writing this book, the author has attempted to prepare a manual on that young but rapidly growing specialty in preventive medicine, which, for want of a better term, may be called carrier work. The subject has been treated as a part of general medicine and surgery, and the book is intended to be of practical value to medical students and physicians, especially those with public health responsibilities. The didactic or text book method of presentation has, therefore, been adopted, rather than the mono graphic. There are already two monographs on this subject in English: The Carrier Problem in the Infectious Diseases, by Ledingham and Arkwright, and Human Infection Carriers, by Simon. The writer's aim is not to compete with these valuable works, but to supplement them. No effort is made to develop the subject historically or bibliographically, except to emphasize certain points or to refer to recent summaries. The idea has been to g've a systematic exposition of current medical theory and practice as relates to carriers. Some idea of the amount of work, which has been and is being devoted to this subject, can be gath ered from the fact that there are in the catalogue of the Surgeon General's Library, on typhoid carriers alone, over three hundred references to recorded experiences. An effort has been made to collect, from these sources and from practical experience, the lessons that survive the test of time and trial and thus deserve a. Place in the program for the future. The writer has had personal experience with carrier problems from several different angles. On the theoretical side, anyone who in these days works intelligently for the health of groups, as well as of individuals, soon realizes that carriers as well as cases must be considered in any rational and radical program for the control of the infectious diseases. In attempting to study carriers, it was found that animal experimentation afforded a good method of approach, as human carriers are not always available when desired and clinical conditions often cannot be analyzed experimentally. 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.