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acid active adult alcohol animals antigen areas bacilli benzene blood botulism cancer carriers cause cent child City clinical cooperation cultures death rate dental developed diagnosis diet doses effect employes endemic typhus epidemic especially examination factors fever guinea-pigs health department Health Nursing Health Service hospital hygiene immunization important incidence increase indicate infants infection inoculation isolated laboratory larvae lesions malaria ment method milk mortality mosquito negative normal nutrition obtained occurred organisms outbreaks parasites parents patients pellagra period persons physical physician Plasmodium Plasmodium falciparum Plasmodium vivax pneumothorax poliomyelitis positive present problem procedure psittacosis public health pulmonary reaction reported rheumatic Rickettsia rodents serum showed smears solution sputum strains sulfanilamide symptoms syphilis teachers tion treatment tuberculin test tuberculosis tuberculous tularemia typhoid typhoid fever U. S. Pub Univ urine vaccine virus vitamin workers x-ray yellow fever York