Postvaccination anti-typhoid immunity after primary immunization and revaccination according to the results of controlled field trials.
D005500:Follow-Up Studies; D006801:Humans; D007109:Immunity; D007115:Immunization Schedule; D010919:Placebos; D014435:Typhoid Fever / Q000276:immunology* / Q000517:prevention & control; D014611:Vaccination
D010919:Placebos