Message du maire et des rapports de la ville bureau . portedto les agents de santé des lieux où l'attaque oc-curred, à inclure dans leurs dossiers. Il y avait à cette someexceptions, cependant, comme, par exemple, cas portée à la ville des bateaux à vapeur, ou d'autres membres, 26 Rapport de la nécessité et de l'AVERE qui inclus comme Baltimore cas,bien qu'ils ne se posent pas ici. Des cent andtwenty-cinq en dehors des infections, 15 appartiennent à cette classe.Il est intéressant de noter que la majeure partie des cas- classés comme en-dehors de Baltimore affectée a eu lieu en juillet (19), août (2

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Mayor’s message and reports of the city officers . portedto the health officers of the places where the attack oc-curred, to be included in their records. There were someexceptions to this, however, as, for instance, cases broughtto the City on foreign steamships, or from other States, 26 REPORT OF THE and which Avere of necessity included as Baltimore cases, although they did not arise here. Of the one hundred andtwenty-five outside infections, fifteen belong to this class.It is interesting that the- bulk of the cases classified as in-fected outside of Baltimore occurred in July (19), August(23), September (46), October (18)—that is, during theusual vacation time and the period of the greatest incidenceof the disease. The source of infection of 601 cases of the774 was not satisfactorily explained. The morbidity and mortality of typhoid fever for 1915 and1916 compared by months, in tive-day periods, and the dis-tribution of typhoid morbidity, mortalitj and fatality byage, 1916, are shown in the following charts: HEALTH DEPARTMENT. 27. 28 REPORT OF THE Summary— In the six-year period from 1911 to 191C, inclusive, themortality rate from typhoid fever has dropped from 39 to18 per 100, 000 population, and beginning with 1911 threeconspicuous factors have been active in bringing about thisresult. These factors were an improved water sujjply, thedevelopment of the sewerage system with the abandonmentof 41, 211 drop privies, and improvement in the milk supplyby more thorough inspection and control, together withmore or less effective pasteurization of an increasing pro-portion of the milk supph. When the invariable influence of season on the prevalenceof typhoid fever in Baltimore, which I have above pointedout, is considered, very strong reasons appear for suspectingthat milk is now the chief vehicle for the distribution ofthe cause of typhoid fever in Baltimore. The argument runsas follows: There is ample evidence that the typhoid bacil-lus frequently gains entrance t

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