Current programs of national surveillance, including evaluation of vaccines in industrial populations.
D000917:Antibody Formation; D003141:Communicable Diseases / Q000276:immunology*; D003153:Community Health Services; D006306:Health Surveys; D006801:Humans; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000453:epidemiology / Q000276:immunology*; D009787:Occupational Medicine; D010919:Placebos; D011159:Population Surveillance; D012141:Respiratory Tract Infections / Q000276:immunology*; D014481:United States
D007252:Influenza Vaccines; D010919:Placebos