. Typhoid fever; its causation, transmission and prevention . . April. . .May .... June . . July . . August . September . October . November . December . Total 53136 103 45 82 107 595 726747 1008 6761 71 136408167 200182 171 150 311 187 76 56 70 55 211179138 926747 1997 Although typhoid fever had been very abundant in1890, the greatest period of the epidemic began inApril, 1891. It continued without a break for nearlya year; then came a decrease, and then for severalmonths the deaths increased again. Epidemics due to lake pollution are quite likely to beof long duration, for the reason that, a
. Typhoid fever; its causation, transmission and prevention . . April. . .May .... June . . July . . August . September . October . November . December . Total 53136 103 45 82 107 595 726747 1008 6761 71 136408167 200182 171 150 311 187 76 56 70 55 211179138 926747 1997 Although typhoid fever had been very abundant in1890, the greatest period of the epidemic began inApril, 1891. It continued without a break for nearlya year; then came a decrease, and then for severalmonths the deaths increased again. Epidemics due to lake pollution are quite likely to beof long duration, for the reason that, as the epidemicincreases in severity, the sewage of the city becomes moreand more infected, and this increases the number oftyphoid bacilli in the water. Such an epidemic tendsto perpetuate itself, and may continue until all susceptiblepersons have had the disease, or until the conditionsof winds, currents, etc., are such that for a time thecontamination of the water ceases. In 1902 another epidemic occurred in Chicago, — 164 TYPHOID CHICAGO, ILL. DIAGRAM SHOWING THE POPULATION NUMBER OF DEATHS FROM TYPHOID FEVER AND THE TYPHOID DEATH RATES BY YEARS. 1000 Fig. 16. TYPHOID FEVER EPIDEMICS. 165 less in magnitude than the one just described, but yetone which caused the annual number of deaths toincrease from 337 in 1900, to 509 in 1901, and 801 in1902. This epidemic came as a surprise to many ofthe citizens of Chicago, as they had been led to believethat the new drainage canal would effectually act as asafeguard to the water-supply. But the explanationwas obvious. Although the drainage canal was openedin 1900, not all of the sewers had been connected withit, — the intercepting sewer along the south shore, andthe Lawrence Avenue sewer on the north side, for example,had not been completed, — so that a considerable partof the city continued to discharge its sewage into thelake. The epidemic began early in the 193 persons who died in August probably contractedt
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