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accidents adults agencies Agent The etiologic alcoholism American Medical Association animals antibodies areas aseptic meningitis blood cancer cause cent chest chlorine chronic clinical contaminated Coxsackie deaths Definition dental caries detection diabetes diagnosis diet disability dose drugs early effective encephalitis epidemic epidemic typhus Epidemiology Etiologic Agent examination exanthem exposure factors fever fluoride frequently gamma globulin hazards health departments health education hospital human illness immunity important increase incubation period individual industrial infants infection injuries ionizing radiation Journal laboratory lesions malocclusions method milk Mode of Transmission nutritional obesity occur organism patient persons physical physician poisoning poliomyelitis pollution population practice pregnancy preventive medicine problem radiation rehabilitation reported require rickettsiae roentgen roentgenograms screening tests serum sewage skin sludge social studies Susceptibility symptoms syphilis therapy tion tissue treatment tuberculosis types typhus United usually vaccine virus viruses workers York