BENEFITS OF FILTRATION IN CINCINNATI.

BENEFITS OF FILTRATION IN CINCINNATI.

The value of filtration is ably set forth by Dr. J. H. Landis, City Health Officer of Cincinnati, O., in a letter prefacing the annual report of his department. He discusses in detail the remarkable reduction in typhoid fever mortality rates in the Ohio River metropolis since the installation of a plant for the filtration of the city’s water supply. In the eight years since Cincinnati installed its filtration system 271 residents of that city have died from typhoid fever. In the eight years immediately preceding the installation of the filtration system the number of deaths from typhoid was 1,470. During the last year before filtration was adopted, typhoid claimed 157 victims in Cincinnati; during the first year after the filtration plant was placed in operation this number was reduced to 64, and, despite a steadily increasing population, the typhoid mortality list has decreased consistently and steadily until, during the first ten and one-half months of the current year until November 5—it has been reduced to 22 deaths from typhoid fever. By way of comparison, Dr. Landis prepared tables showing the number of deaths from this disease for the last 16 years, eight years before the installation of the Cincinnati filtration system and the eight years that have passed since Cincinnati’s water supuly has been purified by filtration: 1900, 119 deaths; 1901, 180 deaths; 1902, 206 deaths; 1903, 144 deaths; 1904, 270 deaths; 1905, 155 deaths; 1906, 239 deaths; 1907, 157 deaths. I otals, 1,470 deaths. Filtration began in November, 1907. 1908, 64 deaths; 1909, 46 deaths; 1910, 21 deaths; 1911, 43 deaths? 1912, 28 deaths; 1913, 24 deaths; 1914, 23 deaths; 1915*, 22 deaths. Totals, 271 deaths. *—l o November 15. The Cincinnati health officer’s report for 1914 contains this reference to the theory that the saving of one life from typhoid through an improved water supply means the saving of several more from general causes: “A comparison of deaths due to typhoid for the two seven-year periods before and after filtration was begun shows a saving of 1,102 lives during the second sevenyear period. A comparison of the deaths from respiratory diseases alone for the same periods shows , a decrease of 1,960 deaths for the second year period.”

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