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agar agglutination Annual Meeting antigen bacteria birth bovine British Columbia broth Canada Canadian Public Health cancer carbonate cause cent child chlorine clinics communicable diseases cost cultures dairy death rate Department of Health diphtheria doctor Dominion epidemic equipment examination factors filtration heart disease hospital immunization important increase individual industrial infection interest laboratory lesions Manitoba ment mental hygiene method milk supply milk-borne Montreal mortality municipal muscles Nabarro occurred Ontario Health Officers operation organization Ottawa paralysis paratyphoid fever pasteurization patients period persons physician plant poliomyelitis population positive practice present preventive medicine problem programme province Public Health Association public health nurse Quebec raw milk reported Ridgers sanitary sanitation Saskatchewan scarlet fever Section sera serum sewage social strains syphilis tion toxin trachoma treatment tuberculosis typhoid fever United University of Toronto Vital Statistics water supply workers