Excerpt from The Public Health Journal, Vol. 7: July, 1916 The disease is, in nature, of widespread though rare sporadic or endemic occur rence. In epidemics it has occurred in recent years over a large part of the world the outbreaks being sometimes discrete, at other times Spreading rapidly, but ir regularly, over wide areas. Such epidem ics characteristically run a rather rapid course in a given community, declining after a few months or less, after having attacked (so far as is evident) only a small proportion of the total inhabitants. Usually not more than one' in a thousand; and do not recur in the same locality for a period of at least two years. In epi demic foci children under 5 are attacked much more often than are older persons, the whole adult population remaining vir tually immune in some epidemics. 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.